part per hundred million

简明释义

亿分之一

英英释义

例句

1.The safety standards for drinking water often specify limits on contaminants at part per hundred million levels.

饮用水的安全标准通常规定污染物的限制在每亿分之一的水平。

2.The concentration of certain pollutants in the air is measured in part per hundred million, which indicates how many parts of the pollutant are present in one hundred million parts of air.

某些污染物在空气中的浓度以每亿分之一来衡量，这表示在一亿部分的空气中存在多少部分的污染物。

3.In the study of trace elements in water, scientists found levels of lead at part per hundred million in several samples.

在水中微量元素的研究中，科学家发现几个样本中的铅含量为每亿分之一。

4.Environmental regulations often require monitoring of chemicals in the environment at part per hundred million thresholds.

环境法规通常要求监测环境中化学物质的浓度在每亿分之一的阈值内。

5.When analyzing soil samples, researchers reported a concentration of arsenic at part per hundred million.

在分析土壤样本时，研究人员报告了砷的浓度为每亿分之一。

作文

In today's world, understanding the concept of measurements is crucial, especially in fields like science, engineering, and environmental studies. One such measurement that often comes up is part per hundred million, which refers to a way of expressing very dilute concentrations of substances. This term is particularly useful when discussing pollutants in the air or water, where even tiny amounts can have significant impacts on health and the environment. For example, when measuring the concentration of lead in drinking water, scientists may express the amount in part per hundred million to highlight the extreme dilution of the substance. The significance of part per hundred million becomes clear when we consider its application in real-world scenarios. In environmental monitoring, regulatory agencies often set safety limits for contaminants based on concentrations measured in part per hundred million. This ensures that even minute levels of harmful substances are accounted for, protecting public health and ecosystems. For instance, if a study reveals that a certain chemical is present at a level of 5 part per hundred million, it indicates that for every one hundred million parts of water, there are five parts of that chemical. While this may seem negligible, it can still pose serious risks, especially with long-term exposure.Moreover, part per hundred million is not limited to environmental studies; it also plays a role in pharmaceuticals and food safety. When testing for contaminants in food products, regulatory bodies may require testing at levels as low as part per hundred million. This rigorous standard ensures that consumers are protected from harmful substances that could be present in their food, even in trace amounts. For example, the presence of pesticides or heavy metals in food can be measured in part per hundred million, ensuring that the food supply remains safe and healthy for consumption.In conclusion, the term part per hundred million is an essential measurement that helps us understand the presence of substances in various contexts. Its application in environmental science, public health, and food safety highlights the importance of monitoring even the smallest concentrations of potentially harmful substances. By using this measurement, scientists and regulators can make informed decisions that protect both human health and the environment. As we continue to face challenges related to pollution and food safety, the understanding of part per hundred million will remain vital in our efforts to create a safer and healthier world.

在当今世界，理解测量概念至关重要，尤其是在科学、工程和环境研究等领域。其中一个常见的测量单位是每亿分之一，它指的是表达物质极其稀薄浓度的一种方式。这个术语在讨论空气或水中的污染物时特别有用，因为即使是微小的数量也可能对健康和环境产生重大影响。例如，在测量饮用水中铅的浓度时，科学家可能会以每亿分之一来表示该物质的含量，以突出其极度稀释的特性。每亿分之一的意义在于我们考虑其在现实场景中的应用时变得清晰。在环境监测中，监管机构通常根据以每亿分之一为单位测量的污染物浓度设定安全限制。这确保了即使是微量的有害物质也被计算在内，从而保护公众健康和生态系统。例如，如果一项研究发现某种化学物质的存在水平为5每亿分之一，这表明在每一亿部分水中，有五部分是该化学物质。尽管这似乎微不足道，但长期接触仍然可能构成严重风险。此外，每亿分之一不仅限于环境研究；它在制药和食品安全中也发挥着作用。当检测食品产品中的污染物时，监管机构可能要求在低至每亿分之一的水平上进行测试。这一严格标准确保消费者免受可能存在于食品中的有害物质的侵害，即使是微量。例如，食品中农药或重金属的存在可以用每亿分之一来测量，确保食品供应对消费者的安全和健康。总之，每亿分之一这一术语是一个基本的测量单位，帮助我们理解各种背景下物质的存在。它在环境科学、公共健康和食品安全中的应用突显了监测潜在有害物质即使在最小浓度下的重要性。通过使用这种测量，科学家和监管者能够做出明智的决策，以保护人类健康和环境。随着我们继续面临与污染和食品安全相关的挑战，理解每亿分之一将继续在我们创造一个更安全、更健康的世界的努力中发挥重要作用。