The source is made of semiconductor laser, collimating and coupling system, narrow pulse driving circuit.光源包括半导体激光器 、 准直耦合元件和窄脉冲发射驱动电路.Using video - cam directly collimating on computer screen, it is convenient to operat...
The cello is a member of the violin family.大提琴是提琴家族的一员.She plays the cello in an orchestra.她在管弦乐队中演奏大提琴.His cello technique is unique.他的大提琴(演奏)技巧是独一无二的....
衬衫放在最上层的抽屉里.The shirts go in the top drawer.最上层的抽屉装着各式各样的外国硬币和钞票。The top drawer held a miscellany of foreign coins and banknotes.像他这样才能出众的人终究会升到最上层的.A man of great ability like him will eventually reach the top....