Some spring fracture cause is mainly instability of spring steel quality, and the arts and crafts on heat treatment of steel material matching spring product is necessary to be perfected.
个别弹簧出现折断质量问题，主要原因是弹簧钢材质不够稳定，材料与产品的热处理工艺匹配不够完善。
E. coli attacks the kidneys and can cause seizures, strokes and comas and is mainly found in cucumbers, tomatoes and lettuce.
大肠杆菌破坏肾脏，会引起痉挛，中风和昏迷，它主要存在于黄瓜，番茄和莴笋中。
Fog is mainly will reduce visibility, can cause traffic hidden trouble, but not harm to people.
雾主要会使能见度降低，会造成交通隐患，但对人的危害不大。
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