The main spring of the alarm clock is broken.
闹钟的簧断了。
《新英汉大辞典》
In Britain they put the clock on an hour in spring.
在英国，人们在春季便把时钟拨快一小时。
youdao
He took the spring out of the clock, but now he can't get it back.
他把钟里的发条取了出来，但现在他没法把它装上去了。
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