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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
n. 紧张，拉力，张力，紧张状态，[电]电压
