turn back halfway 反转 ; 改变方向
Halfway up, a passing guide told us if we couldn't get to the top by 12:30 at the latest, then to turn back.
当中途爬到一半的时候，一个路过的向导告诉我们，如果不能在12：30之前到达顶峰，那么就立即返回。
Sometimes, I’d turn around and go back home when I was already halfway there.
有几次，当我已经走在半路上时我都会转身走回家。
The climbers were halfway up the mountain when two of them conked out and had to turn back.
登山队员爬到半山腰时，其中两人筋疲力竭，只得返回。
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