轮胎气压偏低还将增加方向的不稳定性，且加剧轮胎磨损。
Low tire pressure will also increase the direction of instability, and increase tire wear and tear.
河流侵蚀形成陡坎的方向追随河流的冲沟方向，具不稳定性，并且陡坎的倾向沿河对称。
Direction of scarps caused by river erosion follows the river, is unstable and the tendency of scarps is symmetric along the river.
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