The safe protection system of the lift is generally made up of mechanical security protector and electric security protector.

电梯安全保护系统一般由机械安全保护装置和电气安全保护装置两大部分组成。

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The working condition of mechanical components can be indicated by their stress states, whose measurement and evaluation can also improve the security, reliability and stability of the products.

零件的应力状况能够反映机械构件的工作状态，对它的有效检测和评估为提高产品的安全性、可靠性和稳定性提供了保障。

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Compared to the current industry in mechanical products, the market is most concerned about the safety of the product, the product is no more than a lot of advantages but also a security risk.

相较如今行业中的机械产品，市场最多关注的就是产品的安全性问题，一个产品再多的优势也敌不过一个安全隐患。

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Mexican Attorney General spokeswoman Rocio Torres denied her country's involvement with the drone Friday, but later in the day, another Mexican official said the drone was being operated by the Ministry of Public Security and was following a target at the time of the mechanical malfunction.

CNN: Drone crash in El Paso under investigation

So, amid heavy security and overseen by a team of forensic experts led by Istanbul's Chief Prosecutor Turan Colakkadi, mechanical diggers on Tuesday morning dug up Ozal's grave from a grand mausoleum in an Istanbul cemetery.

BBC: Turkey President Turgut Ozal's remains exhumed