The Keck Observatory has been invaluable in detecting extrasolar planets, worlds around other stars that were long postulated but only detected in the last dozen years or so.
近十几年来，人类开始探测到其他恒星周围的行星，在探测太阳系以外行星的过程中，凯克望远镜具有不可估量的的价值。
Nowadays, a film needs superstars as long as there are half a dozen of them together, whereas if it has just one or two main roles, then actors who aren't so well known are fine.
现如今，一部电影只要同时有五、六主要人物，就非得要超级明星来演；与之相反，如果一部电影只有一、两个主要人物，那么不太知名的演员也可以胜任。
In the United States of America, the herb was marketed as a dietary aid, whose long-term use led to at least a dozen deaths, heart attacks and strokes.
在美利坚合众国，这种草药作为助食产品销售，它的长期使用至少造成十几个人死亡、心脏病发作和中风。
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