戴上脑电图帽后,就不能随便乱动,但对开车来说,这是不可能的,尤其是在紧急停车的情况下。
All carbon footprints are hard or impossible to pin down accurately, but the Internet is a particularly complex case.所有的碳足迹都很难或者不太可能精确地算出来,对于互联网,情况更是复杂。
The railway would like to convert another of its locomotives to steam from oil but is reluctant to do so in case it becomes impossible to get the coal.铁路局原本想把另一台使用燃油作为燃料的机车更换为蒸气机车的,但是,他们又不愿这么做了,因为为这台车找到煤似乎是不可能的。