Human beings used stone chips for more than two million years, but human life changed very little in that time.
人类使用石屑超过二百万年，但在那段时间里，人类的生活几乎没有改变。
What can I use to add extra protection against stone chips?
我能使用什么去增加额外的保护来抵挡石头碎片？
The stone chips will cause corrosion if not repaired in time.
碎片剥落如果不及时修补，就会导致锈蚀。
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