1、I'm going to have to knuckle down to some serious study.
我得開(kāi)始認(rèn)認(rèn)真真地學(xué)習(xí)了。

2、He managed to knuckle down to his lessons long enough to pass his examination.
他在離考試還有足夠長(zhǎng)時(shí)間的時(shí)候就開(kāi)始認(rèn)真學(xué)習(xí)，從而通過(guò)了考試。

3、He would not knuckle down under their pressure.
他不會(huì)在他們的壓力下屈服的。

4、You 'll really have to knuckle down if you want to pass the examination.
如果想通過(guò)考試，你確實(shí)應(yīng)專心學(xué)習(xí)。

knuckle down翻譯