... be set in 以…为背景/场景 be set to 认真开始干 in set 成套 ...
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开始认真干 set to ; get down to
开始认真干起来 set to
开始认真地干 get down to
开始认真干某事 get down to doing sth
认真开始干
Knuckle down
以上为机器翻译结果，长、整句建议使用 人工翻译 。
是你开始认真工作，干成一些事的时候了。
It's time you buckled down and got some work done.
youdao
我笑了，他说，“我是认真的，我需要现在就开始干。”
"I laughed, and he said," I'm absolutely serious; I need this written down now.
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