The elastic force makes the coverboard rotate to the second position from the first position so as to expose the opening.
弹力使盖板由第一
转动至第
，使开口得以外露
来。
The elastic force makes the coverboard rotate to the second position from the first position so as to expose the opening.
弹力使盖板由第一转动至第，使开口得以外露来。
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