求翻译：▲始终用防护安全网盖住工件，工件被拉拔时会产生很大的作用力在上面，有时会导致破裂（如多数皮带轮等材质是生铁为主）可减低操作人员受飞出的工件伤害。是什么意思？

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▲ uses to protect the safety net throughout to cover the work piece, the work piece draws when can produce the very big action in above, sometimes can cause the breakage (for example material qualities and so on most belt pulley is pig iron primarily) may decrease the operator the work piece injury

▲ Always protective safety net covering the workpiece, the workpiece is drawing will produce a great deal of force on it, can sometimes lead to rupture (such as most pulley material mainly pig iron) to reduce operator injury from flying out of workpieces.