旁边的小池塘边,一些穿得干干净净的小孩子正在放白帆布船.At a little pond near by some cleanly dressed children were sailing white canvas boats.约翰逊教授在我们学校, 就像是小池里的大鱼,英雄无用武之地了.In our school, Professor Johnson was a big fish in a small pond.我经营自己的公司. ...
Fewer workers are needed to solder circuit boards.焊接电路板需要的工人更少了。Joints between reinforcement members can be made satisfactorily with tin solder.锡焊能够满意地做成加筋构件之间的接头.A number of metals and alloys, how ever , are difficult t...