There are multiple safe protectors: Overweight device, chain fracture device, trailing arm lock protect, device of the lock when it rised.

设有多重安全保护装置：超重装置，断链装置，托臂自锁保护，上升过程中的自锁装置。

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Shortly afterwards he was injured in a car crash and doctors could do nothing with his crushed right arm except lock it in one position.

不久之后，他在一次车祸中受伤，对他那因车祸而变形的右臂，医生们无能为力，只能将其固定于一个姿势。

youdao

To seize the space debris, the mechanical arm need to lock the concrete goal, but in space, debris is changing position.

要抓住太空碎片，这只机械手臂需要锁定具体目标，但在太空中，碎片是不断变换位置的。

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Junior was shot five times while being held in an arm lock, but the 26-year-old has made a "miraculous" recovery with three bullets still lodged in his head, the court was told.

BBC: Man 'shot brothers' after New Year pub row in Croydon

Here humour has truth in an arm lock.

ECONOMIST: Letters

The parts included "brakes, brake pads, brake shoes, ignition coils, water pumps, window regulators, suspension sway bar links, wheel hubs, anti-lock braking sensors, control arm bushings, transmission filters, pitman arms, tie rod ends, and suspension air springs, " the papers add.

WSJ: 3 nabbed in taxi-parts probe; NYC, NJ searches