He must work hard at physics, mustn't he?
他必须努力学习物理，是吗？
The application of physics professional personnel engaged in research work at specific time.
这些使得应用物理专业的人才在从事具体的科研工作时得心应手。
The application of physics professional personnel engaged in research work at specific time.
这些使得应用物理专业的人才在从事具体的科研工作时得心应手。
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