He must be working in his office.
他一定在办公室工作呢。
He must be working in his office.
他必定在办公室工作呢。
The light is on. He must be working.
灯亮着，他一定在工作。
He must be working in his class, I think.
我想他一定正在班里。
The light is still on. He must be working in the office now.
灯还亮着，他现在一定还在办公室工作着。
He must be crazy to continue working in the circus after all the close calls he's had.
他这么多次都差点出事还继续在马戏团工作，一定是疯了。
To be competent in his field, he must develop a working knowledge of this aspect.
为了使自己能胜任所从事工作，必须加深这方面知识。
To be competent in his field, he must develop a working knowledge of this aspect.
为了使自己能胜任所从事工作，必须加深这方面知识。
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