pendulum clock [仪] 摆钟 ; 钟摆动态壁纸 ; 有摆的钟
casing for pendulum clock 摆钟外壳
mechanical pendulum clock movement 机械摆钟机芯
mechanical pendulum clock 机械摆钟
pendulum clock earring 时间表两用耳环
By the 16th century, a pendulum clock had been devised, but the pendulum swung in a large arc and thus was not very efficient.
到了16世纪，人们发明了摆钟，但钟摆摆动的幅度很大，因此效率不高。
He accidentally found that the desk clock did not swing its pendulum.
他无意中发现座钟不摇摆了。
That's how the clock runs, by the pendulum moving from one extreme to the other.
时钟的工作就是依靠钟摆从一个极端摆向另一个极端。
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