bìzhōng [wall clock;bracket clock] 挂钟
薄壁钟本身的浮力影响通常可以忽略不计。
The buoyant effect of the thin-walled bell may be neglected in most cases.
倾听对面墙上壁钟秒针的“忙音”，我突然注意到一种现象，那就是：秒针所发出来的声音大小不同，强弱不一。
Listening to the rhythmical tapping of clock, I suddenly found out that the sound emitted by the second hand was not uniform either in volume or in strength.
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