number one 头等的,自身利益;
at sixes and sevens 乱七八糟;
in seventh heaven 心情很好;
six of one and half a dozen the other 半斤八两;
the eleventh hour 最后时刻;
dress to the nines 衣着华丽;
forty winks 打盹;
a hundred to one shot 可能性很小
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