He refused to knuckle under to the enemy.
他拒绝向敌人投降。
The United States, he said, did not knuckle under to demands.
他说,美国不会屈从于他人的要求。
Meanwhile, our most recent intake, the little dog, still refuses to knuckle under, conducting itself in a manner that runs counter to all stated regulations.
同时,我们最新招收的那位,一只小狗,仍然拒绝服从,他的行为方式就是违反一切已宣布的规矩。
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