parts per billion

简明释义

十亿分之几

英英释义

例句

1.The laboratory reported that the pesticide residue was detected at parts per billion (十亿分之一) levels.

实验室报告显示农药残留物的检测水平为十亿分之一。

2.Regulatory agencies often set limits for heavy metals in food at parts per billion (十亿分之一).

监管机构通常将食品中重金属的限值设定为十亿分之一。

3.In environmental studies, scientists analyze soil samples for toxins in parts per billion (十亿分之一).

在环境研究中，科学家分析土壤样本中的毒素，以十亿分之一为单位。

4.Air quality monitoring stations measure pollutants in the atmosphere in parts per billion (十亿分之一).

空气质量监测站以十亿分之一来测量大气中的污染物。

5.The water sample was tested and found to contain contaminants at a level of parts per billion (十亿分之一).

水样本经过测试，发现污染物的含量为十亿分之一。

作文

Understanding the term parts per billion is crucial in various fields, especially in environmental science and public health. The phrase parts per billion (PPB) is a unit of measurement used to describe extremely low concentrations of substances in air, water, or soil. To put it into perspective, one part per billion means that if you have one billion units of something, only one of those units is the substance being measured. This concept becomes particularly important when discussing pollutants or toxins, where even the smallest amounts can have significant effects on human health and the environment.For instance, consider the presence of lead in drinking water. Regulatory agencies often set limits for contaminants in terms of parts per billion. If the safe level of lead is established at 15 parts per billion, this means that in one billion parts of water, there should be no more than 15 parts of lead. This level of precision is necessary because lead is a neurotoxin that can cause severe health problems, particularly in children. Thus, understanding parts per billion helps us gauge the safety of our drinking water.Moreover, in air quality measurements, the concentration of pollutants such as ozone or carbon monoxide is frequently reported in parts per billion. For example, if the ozone level is reported at 60 parts per billion, it indicates that for every billion molecules in the air, 60 are ozone molecules. Monitoring these levels is essential for public health, as elevated concentrations can lead to respiratory issues and other health concerns.In the context of climate change, scientists also use parts per billion to measure greenhouse gases like carbon dioxide (CO2). As of recent years, atmospheric CO2 levels have surpassed 400 parts per billion, which is a significant increase from pre-industrial levels. Understanding this measurement is critical for grasping the scale of human impact on the planet and the urgency of addressing climate change.Furthermore, in the field of pharmaceuticals, the purity of drugs is often expressed in parts per billion. For instance, a drug might need to contain no more than 10 parts per billion of a certain impurity to be considered safe for consumption. This level of detail ensures that medications are effective and do not contain harmful levels of contaminants.In summary, the term parts per billion is not just a technical measurement; it has profound implications for health, safety, and environmental standards. By comprehending what parts per billion represents, we become more informed citizens who can better advocate for our health and the health of our planet. Whether it is through understanding the safety of our drinking water, the quality of the air we breathe, or the medications we take, recognizing the significance of parts per billion empowers us to make informed decisions and push for necessary changes in policy and regulation. Therefore, the knowledge of parts per billion is essential for anyone who seeks to understand the complexities of modern science and its impact on society.

理解术语parts per billion（十亿分之一）在各个领域中至关重要，尤其是在环境科学和公共卫生方面。短语parts per billion是一种用于描述空气、水或土壤中极低浓度物质的测量单位。为了更好地理解这一概念，十亿分之一意味着如果你有十亿个单位，其中只有一个单位是被测量的物质。当谈论污染物或毒素时，这一概念尤为重要，因为即使是最小的数量也可能对人类健康和环境产生重大影响。例如，考虑饮用水中铅的存在。监管机构通常以parts per billion的形式设定污染物的限值。如果铅的安全水平设定为15parts per billion，这意味着在十亿个水的部分中，铅的部分不得超过15部分。这种精确度是必要的，因为铅是一种神经毒素，可能导致严重的健康问题，尤其是在儿童中。因此，理解parts per billion帮助我们评估饮用水的安全性。此外，在空气质量测量中，臭氧或一氧化碳等污染物的浓度通常以parts per billion报告。例如，如果臭氧水平报告为60parts per billion，这表示在空气中的每十亿个分子中，有60个是臭氧分子。监测这些水平对于公共健康至关重要，因为升高的浓度可能导致呼吸问题和其他健康问题。在气候变化的背景下，科学家们也使用parts per billion来测量温室气体如二氧化碳（CO2）。近年来，大气中的CO2水平已超过400parts per billion，这比工业革命前的水平显著增加。理解这一测量对于把握人类对地球的影响规模以及迫切应对气候变化的必要性至关重要。此外，在制药领域，药物的纯度通常以parts per billion表示。例如，一种药物可能需要含有不超过10parts per billion的某种杂质，以被认为是安全的。这种细节确保了药物的有效性，并且不含有害的污染物水平。总之，术语parts per billion不仅仅是一个技术测量；它对健康、安全和环境标准具有深远的影响。通过理解parts per billion所代表的意义，我们成为更为知情的公民，可以更好地倡导我们的健康和地球的健康。无论是通过理解饮用水的安全性、我们呼吸的空气质量，还是我们服用的药物，认识到parts per billion的重要性使我们能够做出明智的决定并推动政策和法规的必要变革。因此，了解parts per billion对于任何希望理解现代科学复杂性及其对社会影响的人来说都是必不可少的。