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
一位置转
二位置，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.
弹力使盖板一位置转二位置，使开口得以外露来。
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