他们干起活来好像性命攸关似的。
如果淡水降至某个临界点，咸水将上涌与之混合。这样以色列就会失去性命攸关的水源。
If the fresh water were to fall below a certain point, the salt water could rush upward and mix with it, taking out a water supply that is essential for Israel.
在一项新的合成生物学实验中，为数不多的几个与生存性命攸关的细菌基因已经成功的为人造基因所替代。
A handful of bacterial genes crucial to survival were successfully replaced by artificial ones in a new synthetic-biology experiment.
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