一张一弛----alternate tension with relaxation

例句：
A:I have done my work all night and I have been dead beat already!
我熬夜工作了，已经筋疲力尽了。
B:Oh, dear! You should be alternate tension with relaxation.
啊，天啊！你应该一张一弛。

同义词：
stretched and relaxed

注释:
all night 通宵