Compared to the new wheel tread, the worn tread is easy to form two-point contact nearby the depression area of the nominal diameter position of wheel tread.
与新用车轮踏面相比，测试得到的磨耗后车轮踏面在其名义直径位置凹陷区域附近容易形成踏面两点接触。
Knowing that they will suffer if species decline to the point where they must be listed as threatened, mining companies are learning to tread softly around creatures such as the sage grouse.
矿业公司被告知好生款待附近的艾草榛鸡等动物。否则，如果动物因数量减至濒危规定线以下而入册，公司的日子将不好过。
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