densities

简明释义

英[ˈdɛn.sɪ.tiz]美[ˈdɛn.sɪ.tiz]

n. 密度（density 的复数）

英英释义

单词用法

同义词

反义词

例句

1.However, at times of high vector densities the relative importance of mosquito-to-human transmission may increase.

不过，在媒蚊密度较高时，蚊虫向人传播病毒的相对重要性可能增加。

2.They both had bone densities of a 77-year-old woman。

有一对23 岁的双胞胎姐妹参加了我们的研究项目，她们的骨密度相当于一个77 岁老妇的骨密度。

3.The content of the survey involved the volume density, surface and length densities.

内容涉及到各种组织的体积分数、面积密度、长度密度等。

4.Stars with similar masses might not be similar in size because they have different densities.

相似质量的恒星可能在大小上有所不同，因为它们有着不同的密度。

5.Our Stipple params create varying densities of noise to simulate that look.

我们的画点画参数创造不同密度的噪音模拟的期待。

6.I have a question about densities.

我对密度有个问题要问。

7.And the electronics industry needs much greater data densities for tomorrow's iPods, smart phones, and other devices.

为了明天的新iPod、智能手机和其他电子产品，现代电子工业需要更大的存放密度和更长的存放时间。

8.The cultivation of crops has expanded into progressively drier regions as population densities have grown.

随着人口密度的增长，农作物的种植已经扩展到了越来越干旱的地区。

9.Studying the densities (密度) of stars helps astronomers understand their lifecycle.

研究恒星的密度（密度）有助于天文学家理解它们的生命周期。

10.The densities (密度) of liquids are often measured to determine their purity.

液体的密度（密度）通常被测量以确定其纯度。

11.In geology, the densities (密度) of different rock types provide clues about their composition.

在地质学中，不同岩石类型的密度（密度）提供了有关其成分的线索。

12.Different materials have varying densities (密度), which affects their buoyancy in water.

不同材料具有不同的密度（密度），这会影响它们在水中的浮力。

13.The densities (密度) of gases can change significantly with temperature and pressure.

气体的密度（密度）可以随着温度和压力的变化而显著改变。

作文

In the realm of science and engineering, the concept of densities (密度) plays a crucial role in understanding the properties of materials. Densities refer to the mass per unit volume of a substance, and this measurement can significantly influence how materials behave under various conditions. For instance, when designing structures, engineers must consider the densities of the materials they are using to ensure stability and safety. A material with a high density (高密度) may provide strength but could also add unnecessary weight to a structure, while a low density (低密度) material might be lightweight but not strong enough to support the load it is meant to carry.Moreover, the densities of liquids and gases are equally important in fields such as chemistry and physics. For example, when mixing different solutions, the densities of the liquids involved will determine how they interact. A liquid with a lower density will float on top of a liquid with a higher density, which is a principle that can be observed in everyday life, such as when oil is poured into water. Understanding these interactions helps chemists predict the outcomes of reactions and design experiments accordingly.In environmental science, the densities of various materials can impact ecological systems. For instance, the densities of pollutants in bodies of water can affect aquatic life. A higher concentration of pollutants, which corresponds to a higher density, can lead to detrimental effects on fish and other organisms. Therefore, monitoring the densities of contaminants is essential for maintaining healthy ecosystems and ensuring the sustainability of our natural resources.Furthermore, the concept of densities extends beyond physical sciences into social sciences as well. In sociology, the population densities (人口密度) of urban areas can influence economic development, social interactions, and infrastructure planning. High population densities can lead to challenges such as overcrowding and increased demand for housing and services, while low population densities might result in underutilized resources and limited access to amenities.In conclusion, the term densities encompasses a wide range of applications across various fields. Whether we are discussing the densities of materials in engineering, the densities of solutions in chemistry, the densities of pollutants in ecology, or the densities of populations in sociology, understanding this concept is vital for making informed decisions and solving complex problems. As we continue to explore and study the world around us, the significance of densities will remain a fundamental aspect of scientific inquiry and practical application.

在科学和工程领域，densities（密度）的概念在理解材料特性方面发挥着至关重要的作用。Densities指的是某种物质的单位体积质量，这一测量可以显著影响材料在各种条件下的表现。例如，在设计结构时，工程师必须考虑所使用材料的densities以确保稳定性和安全性。具有高density（高密度）的材料可能提供强度，但也可能给结构增加不必要的重量，而低density（低密度）材料可能轻便但不足以支撑其所需承载的负荷。此外，液体和气体的densities在化学和物理等领域同样重要。例如，在混合不同溶液时，参与液体的densities将决定它们之间的相互作用。具有较低density的液体会浮在具有较高density的液体上方，这一原理可以在日常生活中观察到，比如当油倒入水中时。理解这些相互作用有助于化学家预测反应的结果并相应地设计实验。在环境科学中，各种材料的densities可能会对生态系统产生影响。例如，水体中污染物的densities可能会影响水生生物。污染物的浓度越高，对应的density就越高，这可能对鱼类和其他生物造成有害影响。因此，监测污染物的densities对于维持健康的生态系统和确保自然资源的可持续性至关重要。此外，densities的概念不仅限于自然科学，还扩展到社会科学。在社会学中，城市地区的人口densities（人口密度）可以影响经济发展、社会互动和基础设施规划。高人口densities可能导致拥挤和对住房及服务的需求增加，而低人口densities可能导致资源利用不足和便利设施的获取有限。总之，densities这一术语涵盖了各个领域的广泛应用。无论我们是在讨论工程中的材料densities、化学中的溶液densities、生态学中的污染物densities，还是社会学中的人口densities，理解这一概念对于做出明智的决策和解决复杂问题至关重要。随着我们继续探索和研究周围的世界，densities的重要性将始终是科学探究和实际应用的基本方面。