科学家们对全球变暖感到非常担忧。
The scientists showed great concern about the warming of the earth.
所有望远镜都没有注意到它，这令科学家们感到担忧。如果它再大一些，就可能造成一场大灾难。
Scientists are concerned that it was not spotted by any telescopes, and that had it been larger it could have caused a disaster.
长久以来，科学家们和监管机构对有机磷酸酯都很担忧。 因为有机磷酸酯会对昆虫和人类的神经活动中一种很重要的酶产生不可逆的阻碍。
Organophosphates have long worried scientists and regulators because they irreversibly block an enzyme critical to nerve function in both insects and humans.
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