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By the age of 19 Gauss had discovered for himself and proved a remarkable theorem in number theory known as the law of quadratic reciprocity.高斯19岁时已经独立地发现并证明了数理定律一二次互反律。

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We shall design a barrel through which projectiles are to be fired comprised of a metal barrel shaped substrate upon at least the inner surface of which is coasted a relatively thin layer of a dense, hard wear and corrosion resistant vapor-deposited material having a Moh’s scale hardness of about 8 to 9我们将设计一种发射子弹的枪筒，它有一个圆筒形金属衬套，至少要在衬套内壁镀上一层致密耐磨且防蚀的气相淀积薄膜，其莫氏硬度约为8-9。

Pulling U.S. troops out of Europe was opposed by a House of Representatives Subcommittee Thursday on grounds that they are the psychological epoxy of the Alliance, the glue that holds Nato together.星期四美国众议院一个小组委员会反对从欧洲撤出美军，理由是他们是联盟心理上的凝聚力量，是把大西洋公约组织结合在一起的黏合剂。

The process of cloning an adult animal is technically very complex and undertaken in highly sophisticated academic and commercial environments克隆一成年动物的过程从技术上来说非常复杂，并且是在极为周密的学术和商业环境中进行的。

When they are old enough to move out on their own, many of them will certainly choose Tokyo --if only for the shops, as one high school girl explains.到这些女孩子长大可以外出自己谋生时，她们中的许多人肯定会选择东京。正如一位高中女生说的那样，仅是为了商店，她们也会去东京。