He and I have talked through this whole tricky problem.他和我把这个棘手的问题整个儿都讨论清楚了。It's been a tricky business marketing his new invention.推广他的新发明一直是件棘手的事情。But the whole question of aid is a tricky political one.但是整个援助问题是个...
There are several ways to separate excited from unexcited molecules, thus harvesting the desired isotope.目前有几种方法可以把受激发分子同未受激发分子分离开, 这样,就可以大量得到我们所需要的同位素了.He was still unexcited.他仍然不激动....