例句與造句

1. His team ' s sensors are engineered at the nanoscale ? the size of molecules ? and are cheap because they ' re etched out of flakes of silicon , the stuff of computer chips and beaches
   這種傳感器的尺寸在毫微級(jí)分子大小而且很便宜，因?yàn)樗鼈兌际怯霉柙乇∑ㄓ?jì)算機(jī)芯片和沙灘的組成成分）作出來的。
2. It's difficult to find etch out in a sentence. 用etch out造句挺難的