It's important to tighten up the wheels properly, otherwise they vibrate loose and fall off.
把车轮拧紧很重要，否则它们会振动而松脱。
《柯林斯英汉双解大词典》
It could be that the nearside wheels went on to that area of thicker loose chippings.
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应用推荐
模块上移
模块下移
不移动