The nano filtration membrane is composed of nanometer grade micropore capillary tube bundles.所述的纳滤膜是由纳米级微孔毛细管束构成.I flunked math in second grade.我二年级时数学不及格。The front end is equipped with hydraulic jacks used for grade adj...
The boy first showed promise as an athlete in grade school.这个男孩在上小学的时候就初次显示出成为运动员的潜力。South Point College does not grade the students' work.南点学院不对学生的作业评分。It was actually used for enriching uranium to weapons-grade le...
Thirteen per cent of Christie's coin and banknote auction went unsold.佳士得13%的硬币和纸币拍卖流拍。I put the coin in the machine and pulled the lever.我把硬币投入机器，拉动控制杆。The golden rule is never to clean a valuable coin.重要的原则是决不清除贵重...
A ratchet mechanism transfers the thread from spool to bobbin.一种棘齿装置把线从线轴转到梭心上。On dictation equipment, a spool on which magnetic tape is wound.在口述记录设备上, 一种卷绕磁带的轴.a spool of cotton一轴棉线a spool of thread一轴线...