His son knuckled down to work.
他的儿子努力工作。
The manager drove the workers hard, but they never knuckled under.
经理对工人很苛刻，但是他们从不屈服。
She finally knuckled under because the pressure was simply too much.
压力实在太大了，她最终还是屈服了。
She finally knuckled under because the pressure was simply too much.
压力实在太大了，她最终还是屈服了。
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