为什么不给所有的镜头都配上遮光罩呢？Why aren't all lenses supplied with a lens hood?因此我们得制作一块很大的遮光窗帘。We therefore had to contrive a very large black-out curtain.那网球裁判戴着遮光帽檐.The tennis umpire wore an eye - shade....
It was actually used for enriching uranium to weapons-grade levels.实际上，它是用来将铀浓缩以制造武器。Enriched uranium is a key component of a nuclear weapon.浓缩铀是核武器的关键组成部分。Uranium is soluble in sea water.铀可溶解于海水。...