委托培养硕士生的英文：
training postgraduate for Master's degree on commission

the tail of a train
火车的尾部

explosive train
火药系

Is this dog trained?
这狗受过排便训练吗？

She is a postgraduate at the university of chicago.
她是芝家哥大学的一名研究生。

Is the graduation thesis a requirement for postgraduate students?
研究生都必须撰写毕业论文吗？

This year's enrolment of the examination for Postgraduates has finished recently.
今年的研究生考试报名工作近日结束。

a master of disguise
伪装的能手.

This is the work of a master hand.
这是一位名家的作品。

Sir, you are truly a master of disguise.
长官，你真是伪装大师。