观测开始之前的一项主要工作是认真选点.Careful reconnaissance is essential before observations begin.论述了用支撑柱加固无梁板的选点原则.The principle for choosing supporting points for strengthening flat - slab Was discussed.凡是由几个任意选点确定的球面都是同心面.The spherica...
Observers have recently found in the Universe giant voids about 500,000,000 light-years across.观察员最近在宇宙中发现了直径约5亿光年的巨型空洞。Some military observers fear the US could get entangled in another war.一些军事观察家担心美国会卷入另一场战争。Internati...
有人甚至说，他之所以任命自己的政治对手，是因为他知道所给的职位是杯诱人的毒酒，接受者肯定撑不过一年。Some people even claimed that he appointed his political rival only in the belief that he was giving him a poisoned chalice and that he would not last more than a year.肝脏...