在《清洁空气法案》强制要求美国使用无铅气体的二十年里,铅在世界范围内的累积量显著下降。
In the twenty years that the Clean Air Act has mandated unleaded gas use in the United States, the lead accumulation worldwide has decreased significantly.
它并不是要求或者强制的。
同样,为所有参与的服务器都设置公共uri,这是一个强制性的要求。
Also, setting the public URI for all participating servers is a mandatory requirement.
It was nice because it wasn't just, "Okay, Let's write a story" or "Let's do a research about the animal" or "Let's do a poem about fish".
说它出色,因为孩子们这样做,不是因为老师要求“,或布置的任务“,或学校强制。
Right. Related to that: attendance here is obviously not mandatory.
对了,关于那个事儿:,出勤明显不是强制要求的。
Does science require that we believe in the physicalist view or not?
科学有没有强制要求,我们接受物理主义的观点
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