These are used when strong rotation resistance is required (for instance, to cover ball screws) and where a very compact closed pack is required.

当需要强大的反旋转能力（例如保护球形螺丝钉）和当需要非常闭合紧凑的结构时。请全胜这些形式的护罩。

youdao

You should curl up (蜷缩) into a ball and cover your head and neck with your hands.

你应该蜷缩起来，用手护住头和脖子。

youdao

The child was asked to go to the corner of the room and to cover his or her eyes before coming back and guessing which of two large boxes contained a hidden ball.

这个小孩会被要求走到房间的一角，遮住他或她的眼睛，然后回来猜一下两个大盒子中的哪个包含了一个隐藏的球。

youdao

Evans struck with his fourth ball of the day to have home captain Alex Gidman also held by Hall at slip and later had Chris Taylor caught by Stephen Peters at extra cover the ball after being hooked for six.

BBC: Northants wrap up win over Gloucestershire

Defaulted loans in particular ripped the cover off the ball, with an 8.42% gain.

FORBES: S&P/LSTA Index Loan Index Hits All-Time High With A 2.18% Gain In Jan.

The high yield universe excluding telecoms did not exactly knock the cover off the ball.

FORBES: Wall Street Is Getting Better At Creating 'Junk'