optional obligation
网络释义
大学课程中英语词汇第52页 ... 光电技术PhotoelectricTechnology 光电检测与信号处理OptoelectronicDetectionandProcessing 光电课程设计PhotoelectricCourseExercise ...
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原声例句
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These are completely optional, not required for the course, so there's no obligation for you guys to get involved in these things, but I'll mention these things as we go along in case anybody would like to get involved in working with professors or graduate students.
这些都是自愿选择的,而不是课程要求,所以并不强制你们都参加,但随着课程的进行,我还会不断提及,便于任何感兴趣的同学,能够与教授或研究生一同参与研究
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