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Spring starts when the day and night are the same length.
当白天和黑夜一样长时，春天就开始了。
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Length or load adjustment devices can be incorporated into the spring.
长度或荷载调节设备可加到弹簧中。
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Length or load adjustment devices can be incorporated into the spring.
长度或荷载调节设备可加到弹簧中。
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