That jerk nearly tossed my orange juice to the ceiling.

这次颠簸几乎把我的桔子汁颠到天花板上去了。

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An overwhelming urge to keep moving the legs, a deep ache, or legs that jerk spontaneously disrupts sleep and causes tiredness.

压倒性的尽力使腿部移动，疼痛感会加重或者腿不由自主地抽搐会影响睡眠并导致疲劳。

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This jerk meant that kites could lift huge weights, Gharib realised.

加里布意识到，这一下抽动意味着风筝可以提起巨大的重量。

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The report argues that knee-jerk responses to past tragedies have led to a defensive child protection system that tries to prevent mistakes by setting performance indicators and procedures for what needs to happen.

BBC: Analysis: Less heat, more light on child protection

"If you put out ideas that are really thoughtful and thoroughly vetted, there's less of a likelihood that we will get an overreaction legislatively, or any other way, to jump toward knee-jerk solutions that are sub-optimal, " Paulson says.

FORBES: Magazine Article

And I think that it's important when we're talking about this issue to make sure that we don't just knee-jerk, use language that is inflammatory or in some fashion discourages the possibility of negotiation.

WHITEHOUSE: Creating New Jobs by Investing in High-Speed Rail