This may sound like a dumb question, but I 'd like to know the mechanism of a clock.
这也许听起来象个愚蠢的问题，不过我想知道时钟的结构。
DUMB】The class remained dumb when the teacher asked a difficult question.
当老师问一难题时，全班哑口无言。
The class remained dumb when the teacher asked a formidable question.
类当老师问一个令人生畏的问题保持沉默。
The class remained dumb when the teacher asked a difficult question.
当老师问了一道难题时，全班哑口无言。
The class remained dumb when the teacher asked a difficult question.
当老师问了一道难题时，全班哑口无言。
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