The caps were almost completely loosened by him.

螺丝帽几乎被他完全拧松了。

金山词霸

The tapped collar or socket that receives this rod.

螺丝帽:用于接受螺钉的螺管套或基座.

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Exposed nut covered with cap for protection and attraction.

外露螺丝盖上螺丝帽后,既美观,又有保护作用.

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There are many more screws than nuts.

螺丝帽的数量怎么会多于螺丝钉的数量呢?

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