it's acting up again 出毛病
it's acting up again
它又出毛病了
以上为机器翻译结果，长、整句建议使用 人工翻译 。
My car wouldn't start again this morning – it's always acting up lately.
我的车今天上午又没发动起来-它最近老是出毛病。
youdao
It's also worth remembering that it was in Miami last year that Nadal's left knee began acting up again (he withdrew from the event after reaching the semifinals).
WSJ: Paths Differ but Goals Same for Nadal, Federer
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