一颗螺丝
A screw
以上为机器翻译结果，长、整句建议使用 人工翻译 。
有一颗螺丝松了。
One of the screws is loose.
《牛津词典》
人们总是说一颗螺丝坏了一锅汤。
People say that success has a thousand fathers but failure is an orphan.
youdao
其中有一颗螺丝钉松了。
One of the screws had worked loose.
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