介绍:
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More than 20 tidy wheels are packed neatly inside a watch. You ca here them tick and tock as the teeth of one wheel lock into the teeth of the next. The moving wheels keep time, and slowly turn the hands around the watch face.
1.tick：发出滴答声
tick and tock 滴答，滴答
2.packed:充满…的
3.watch face：表盘面
