他告诉孩子们每一种昆虫对污染的敏感性，并要求他们据此推算出池塘的污染程度。
They are told how sensitive each species is to pollution, and asked to work out from this how polluted the pond is.
本文首先对京沪高速铁路各个时期所能实现的最高速度进行了论证，并据此推算出最小曲线半径值；
The paper first demonstrates the maximum speeds that can be achieved at the different stages of Beijing-Shanghai High-speed Railway and derives the minimum curve radius on the basis of them.
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