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1·If the strain exceeds the tolerable limit, the Si-O-Si linkage can break easily at high temperature and lead to the creation of positive and negative charges on silicon and oxygen atoms, respectively.

如果张力超过耐受极限，硅氧烷键就很易在高温下发生断裂并在硅和氧原子上分别形成正负电荷。

2·The nations of the world agreed years ago to try to limit global warming to a level they hoped would prove somewhat tolerable.

几年前，世界各国一致同意，把全球变暖趋势限制在一个他们希望多少可以容忍的水平。

3·The hope is that the level of CO2 in the atmosphere can thus be kept below what is widely agreed to be the upper limit for a tolerable level of global warming, 450 parts per million.

人们希望，这样一来，大气中CO2的含量可以保持在百万分之450以下。人们普遍认为，这就可以让全球气候变暖的程度处在可容忍的上限以下。