求翻译：滑轮、链轮、皮带轮和导向device ，应设计和制造成使悬挂系统能保持本条规定的safety factor，并在规定更换绳索、链条和皮带的最短寿命期内维持不变。是什么意思？

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Pulley, chain wheels, pulley and orientation device and design and systems caused the suspension systems can maintain this article provides the safety factor, and the replacement of ropes, chains and belts within the shortest life span will remain unchanged.

The pulley, the chain wheel, the belt pulley and guide device, should design and make enables the suspension system to maintain this stipulation safety factor, and in the stipulation replacement rope, the chain link and in the leather belt most short life time maintains invariably.

Pulleys, sprockets, belt wheels and steering device, shall be designed and manufactured to make the suspension system can maintain the safety factor of the provisions of this article, and provides for replacement of ropes, chains and belts of the shortest life remained unchanged during the period.

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