沉重的书本让书架中间的木板下陷了。
The heavy books made the middle shelf ___sag noticeably.
比赛后半程，他的体力明显下降了。
His stamina ___sagged noticeably in the second half of the match.
旧窗帘因为年久失修而松垮地垂着。
The old curtains were ___sagging loosely due to years of wear.
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