单词:ceramic coated metal cutting tool
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By Caty Weaver Broadcast: July 25, 2003 This is Bill White with the VOA Special English Environment Report. Researchers say they have found a way to reduce the cost of some 1)fuel cell production. The
Lesson 55 How It Got the Name 一个名字的由来 Words: crevice n. 缺口,裂缝 crew n. 全体人员,(工作)队 crimson adj. 深红色的 cringe n. 畏缩 cripple vt. 削弱,使残废 crisp adj. 脆的,易碎的 crisscross vi. (十字)交叉;vt. 在。。。上交叉往来,往返奔
Broadcast: May 5, 2003 By Jill Moss This is the VOA Special English Development Report. Each year more than two-million people die from diseases caused by drinking dirty water. That is the estimate of
By Carolyn Weaver New York 09 August 2007 Design is a topic most often associated with luxury goods. But an exhibit at the Cooper-Hewitt National Design Museum in New York focuses on innovative ways to address the needs of the world's poor. The objec
金属切削 metal cutting 机床 machine tool 金属工艺学 technology of metals 刀具 cutter 电路 circuit 半导体元件 semiconductor element 反馈 feedback 发生器 generator 直流电源