Slacken your legs and slowly lie back.
放松双腿, 
向后躺下。
；松劲，
缓；松弛Slacken your legs and slowly lie back.
放松双腿, 向后躺下。
We’ve been really busy, but things are starting to slacken off now.
我们忙极
，不过现在事情开始减少。
Better have no war for a thousand days than slacken your vigilance for one day.
宁可千日不战,不可一日不备。
Simon allowed his pace to slacken.
西蒙放
步。
Work slackens on a hot day.
热天工作缓。
The car has slackened its speed.
车速放。
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