Commutation relation

commutation [[ˌkɔmju(:)'teiʃən]]

n. 交换, 变换, 代替\\n[电] 整流

relation [rɪ'leʃən]

n. 关系;联系;关联;亲属;

relat=relate关联 + ion 名词后缀 → 关系，联系；家属

Which band of College English Test have you passed?

大学英语考试过了几级？

One butcher does not fear many sheep.

屠夫不怕羊多。

Mead predicts that inventors will be able to perfect powerful customized chips over a weekend at the office -- spawning a new generation of garage start-ups and giving the U.S.a jump on its foreign rivals in getting new products to market fast.

米德预言发明者可以在办公室用一个周末的时间生产了完美的、功能很强的、按客户需求设计的芯片 -- 造就新一代从汽车间起家的技术人员，在把产品推向市场方面使美国把它的外国对手们打个措手不及。