pushdown

简明释义

英[ˈpʊʃdaʊn]美[ˈpʊʃdaʊn]

n. 后进先出存储器

adj. 可按下的；可推下的；后进先出存储的

英英释义

单词用法

同义词

反义词

例句

1.Figure 5 shows the Pushdown entities panel.

图5显示了叠加实体面板。

2.Changing certain nickname attributes can improve performance by influencing which operations can be considered for pushdown.

通过改变某些昵称属性，可以考虑叠加哪些操作，以提高性能。

3.In this article we'll take a close look at the triceps pushdown.

在本文中，我们将采取三头肌下推的密切关注。

4.An index pushdown USES the pushed-down keys to perform index lookups on a foreign key index of the fact table.

索引下推使用下推键执行事实表外键索引的查询。

5.We will use the application model in Figure 3 to illustrate the development and deployment process for the pushdown capable CMP bean, the steps for which will be described in following sections.

我们将在图3中用应用程序模型演示可叠加的CMPbean的开发和部署流程，其步骤将在下面的部分中描述。

6.After saving this CMP bean, the Pushdown entities panel will look like Figure 8.

保存该CMPbean后，叠加实体面板将类似于图8。

7.The remainder of this article uses this BankAccount application to illustrate the development and deployment steps of a pushdown capable CMP bean.

本文剩下的部分用这个BankAccount应用程序来演示可叠加的CMP bean 的开发和部署步骤。

8.The pushdown 下压策略 in our marketing plan aims to reach a broader audience.

我们营销计划中的pushdown 下压策略旨在覆盖更广泛的受众。

9.During the meeting, we discussed the new pushdown 优先级调整 in our project timeline.

在会议上，我们讨论了项目时间表中的新pushdown 优先级调整。

10.The pushdown 推送框 feature helps in reducing clutter on the main page.

该pushdown 推送框功能有助于减少主页面的杂乱。

11.The website features a pushdown 下拉菜单 that allows users to navigate easily.

该网站有一个pushdown 下拉菜单，方便用户导航。

12.In our app, we implemented a pushdown 推送通知 system to keep users updated.

在我们的应用中，我们实现了一个pushdown 推送通知系统，以保持用户更新。

作文

In the realm of computer science, the term pushdown refers to a specific type of data structure known as a pushdown automaton. This automaton is particularly interesting because it utilizes a stack to keep track of information. The concept of a stack is fundamental in programming and algorithm design; it operates on a Last In, First Out (LIFO) principle, meaning that the last element added to the stack will be the first one to be removed. The pushdown automaton enhances the capabilities of finite state machines by allowing them to use this stack for additional memory, which enables them to recognize a broader class of languages, specifically context-free languages.One of the most common applications of pushdown automata is in parsing expressions in programming languages. When a compiler translates source code into machine code, it must understand the hierarchical structure of the code. For example, consider the expression (a + b) * c. The parentheses indicate that the addition should be performed before the multiplication. A pushdown automaton can effectively manage such nested structures by pushing opening parentheses onto the stack and popping them off when a closing parenthesis is encountered. This mechanism allows the automaton to keep track of which operations need to be performed in what order, which is crucial for correctly interpreting the code.Moreover, the pushdown automaton is not just limited to programming languages. It also plays a significant role in natural language processing (NLP). In NLP, understanding the syntactic structure of sentences is essential for tasks such as translation, sentiment analysis, and information extraction. A pushdown automaton can help in parsing sentences by managing the nested grammatical structures that are common in human languages. For instance, when dealing with relative clauses or nested phrases, the automaton can push the current state onto the stack whenever it encounters a new clause and pop it off once the clause is fully processed.The versatility of the pushdown automaton extends beyond theoretical applications; it is also implemented in various software tools and libraries used by developers. Many modern programming environments incorporate features that utilize pushdown principles to enhance code analysis and error checking. By leveraging the stack-based approach, these tools can provide real-time feedback to programmers, helping them catch mistakes early in the development process.In conclusion, understanding the concept of pushdown automata is vital for anyone interested in computer science, programming, or linguistics. The ability to manage hierarchical information through a stack not only broadens the scope of what can be computed but also provides practical applications in areas such as compiler design and natural language processing. As technology continues to evolve, the principles behind pushdown automata will remain relevant, serving as a foundation for more advanced computational theories and practices. Learning about pushdown automata equips individuals with the knowledge to tackle complex problems in various fields, ultimately contributing to the advancement of technology and understanding of language.

在计算机科学领域，术语pushdown指的是一种特定类型的数据结构，称为pushdown自动机。这个自动机特别有趣，因为它利用栈来跟踪信息。栈的概念在编程和算法设计中是基础的；它遵循后进先出（LIFO）原则，这意味着最后添加到栈中的元素将是第一个被移除的元素。pushdown自动机通过允许使用这个栈作为额外的内存，增强了有限状态机的能力，使它们能够识别更广泛的语言类别，特别是上下文无关语言。pushdown自动机最常见的应用之一是在解析编程语言中的表达式。当编译器将源代码翻译成机器代码时，它必须理解代码的层次结构。例如，考虑表达式(a + b) * c。括号表示加法应在乘法之前执行。pushdown自动机可以通过将打开的括号推入栈中，并在遇到关闭的括号时将其弹出，有效地管理这种嵌套结构。这种机制使自动机能够跟踪哪些操作需要以什么顺序执行，这对于正确解释代码至关重要。此外，pushdown自动机不仅限于编程语言。它在自然语言处理（NLP）中也发挥着重要作用。在NLP中，理解句子的句法结构对于翻译、情感分析和信息提取等任务至关重要。pushdown自动机可以通过管理人类语言中常见的嵌套语法结构来帮助解析句子。例如，在处理关系从句或嵌套短语时，当遇到新的从句时，自动机可以将当前状态推入栈中，并在从句完全处理后将其弹出。pushdown自动机的多功能性超出了理论应用；它还在开发人员使用的各种软件工具和库中得到了实现。许多现代编程环境都结合了利用pushdown原理来增强代码分析和错误检查的功能。通过利用基于栈的方法，这些工具可以向程序员提供实时反馈，帮助他们在开发过程中早期捕捉错误。总之，理解pushdown自动机的概念对任何对计算机科学、编程或语言学感兴趣的人来说都是至关重要的。通过栈管理层次信息的能力不仅拓宽了可以计算的范围，还在编译器设计和自然语言处理等领域提供了实际应用。随着技术的不断发展，pushdown自动机背后的原理将保持相关性，作为更高级计算理论和实践的基础。学习pushdown自动机使个人具备解决各个领域复杂问题的知识，最终促进技术的进步和语言的理解。