要么是伦斯顿的学生接触了更多的化学物质，要么是他们比十年前的学生对这些物质更敏感。
Either Renston's schoolchildren have been exposed to greater quantities of the chemicals, or they are more sensitive to them than schoolchildren were ten years ago.
据研究小组，对这些物质的许多人大致相等的水平，在奥运会一水顶针集中的标准游泳池。
According to the study team, many of these substances were concentrated at levels roughly equal to one thimble of water in an Olympic-sized swimming pool.
除了用法律限制非法物质、烟草和酒精的可获得性之外，减少对这些物质需求的干预措施也会改善健康发育状况。
In addition to laws that limit the availability of illicit substances, tobacco and alcohol, interventions to reduce demand for these substances improve the conditions for healthy development.
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