part per billion

简明释义

十亿分之一

英英释义

例句

1.Air pollution levels in the city reached 200 part per billion (十亿分之一) of ozone on hot summer days.

在炎热的夏天，城市的空气污染水平达到了200 part per billion (十亿分之一) 的臭氧。

2.The water quality report showed that the lead concentration was only 5 part per billion (十亿分之一).

水质报告显示铅浓度仅为5 part per billion (十亿分之一)。

3.Regulatory agencies often set limits for contaminants at 1 part per billion (十亿分之一) to protect public health.

监管机构通常将污染物的限值设定为1 part per billion (十亿分之一) 以保护公众健康。

4.The concentration of mercury in the fish was found to be 15 part per billion (十亿分之一).

鱼类中的汞浓度被发现为15 part per billion (十亿分之一)。

5.The lab detected a pesticide residue of 10 part per billion (十亿分之一) in the fruit samples.

实验室在水果样本中检测到10 part per billion (十亿分之一) 的农药残留。

作文

In today's world, the importance of understanding environmental pollutants cannot be overstated. One critical measurement used in environmental science is the concept of part per billion, which refers to the number of units of a substance in one billion units of total solution or mixture. This measurement is particularly relevant when discussing contaminants in air, water, and soil. For instance, when scientists measure the concentration of toxic substances such as lead or mercury in drinking water, they often report their findings in part per billion (十亿分之一). This allows for a precise understanding of how much of a harmful substance is present in a given volume of water. Understanding part per billion is crucial because many pollutants can have devastating effects on human health even at extremely low concentrations. For example, studies have shown that exposure to lead at levels as low as 10 part per billion can lead to serious developmental issues in children. Therefore, regulatory agencies like the Environmental Protection Agency (EPA) set strict limits on acceptable levels of contaminants in drinking water, often measured in part per billion. Moreover, the use of part per billion is not limited to water quality. In air quality monitoring, the concentration of pollutants such as ozone and particulate matter is also expressed in this unit. A reading of 100 part per billion of ozone in the atmosphere may indicate unhealthy air quality, prompting alerts for sensitive populations, such as individuals with asthma. The significance of part per billion extends beyond environmental science; it is also vital in various fields such as pharmaceuticals and food safety. For example, when testing for pesticide residues on fruits and vegetables, regulators may specify that the maximum allowable concentration should not exceed a certain number of part per billion (十亿分之一). This ensures that the food we consume is safe and free from harmful chemicals that could pose health risks. Furthermore, advancements in technology have made it easier to detect substances at the part per billion level. Techniques such as mass spectrometry and gas chromatography allow scientists to identify and quantify trace amounts of chemicals in various samples. This capability has revolutionized the way we monitor environmental health and safety, leading to more informed decisions and policies aimed at protecting public health. In conclusion, the term part per billion (十亿分之一) is a critical measurement that plays a significant role in understanding and managing environmental pollutants. Its application across different fields underscores the importance of precision in measuring contaminants, as even tiny amounts can have substantial impacts on health and safety. As we continue to face challenges related to pollution and environmental degradation, a thorough understanding of measurements like part per billion will be essential for effective policy-making and public awareness. By educating ourselves about these concepts, we can better advocate for a cleaner, healthier environment for future generations.

在当今世界，理解环境污染物的重要性不容小觑。一个在环境科学中使用的关键测量是十亿分之一的概念，它指的是在十亿单位的总溶液或混合物中某种物质的单位数量。当讨论饮用水中的有害物质如铅或汞时，科学家们常常以十亿分之一（part per billion）来报告他们的发现。这使我们能够准确理解在特定体积的水中有多少有害物质存在。理解十亿分之一是至关重要的，因为许多污染物即使在极低浓度下也能对人类健康造成毁灭性影响。例如，研究表明，暴露于低至10十亿分之一的铅水平可能导致儿童严重的发育问题。因此，像环境保护局（EPA）这样的监管机构对饮用水中污染物的可接受限值设定了严格限制，通常以十亿分之一来衡量。此外，十亿分之一的使用并不仅限于水质。在空气质量监测中，臭氧和颗粒物等污染物的浓度也以此单位表示。大气中100十亿分之一的臭氧读数可能表明空气质量不健康，从而对敏感人群（如哮喘患者）发出警报。十亿分之一的重要性超越了环境科学；它在制药和食品安全等多个领域也至关重要。例如，在检测水果和蔬菜上的农药残留时，监管机构可能会规定最大允许浓度不得超过某个十亿分之一（part per billion）。这确保了我们食用的食品是安全的，不含可能对健康构成风险的有害化学物质。此外，技术的进步使得检测十亿分之一级别的物质变得更加容易。质谱法和气相色谱法等技术使科学家能够在各种样本中识别和定量微量化学物质。这一能力彻底改变了我们监测环境健康和安全的方式，促使更明智的决策和政策以保护公众健康。总之，术语十亿分之一（part per billion）是一个关键测量，在理解和管理环境污染物方面发挥着重要作用。它在不同领域的应用强调了在测量污染物时精确的重要性，因为即使是微小的数量也可能对健康和安全产生重大影响。随着我们继续面临与污染和环境退化相关的挑战，全面理解如十亿分之一这样的测量将对有效的政策制定和公众意识至关重要。通过教育自己了解这些概念，我们可以更好地为未来几代人倡导一个更清洁、更健康的环境。