off day
柯林斯詞典
1. N-COUNT If someone has an off day, they do not perform as well as usual. 未能發(fā)揮正常水平; 狀態(tài)不佳[非正式]
A teacher who merely has an off day in the classroom cannot be dismissed for incompetence. 一個教師偶爾在課堂上發(fā)揮欠佳不能被看成不稱職而遭免職。
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