I beg your pardon, I didn't mean to tread on your foot.
我很抱歉，我并非有意踩你的脚。
Scrape the mud on the floor together in order not to tread on it.
把地板上的泥堆集在一起，别踩在上面。
The tread on the tyres has (been) worn down to a dangerous level.
轮胎胎面花纹已经磨损得到了能发生危险的地步了。
The tread on the tyres has (been) down to a dangerous level.
轮胎胎面花纹已经钮损得到了能罚生危险的地簿了。
The tread on the tyres has (been) down to a dangerous level.
轮胎胎面花纹已经钮损得到了能罚生危险的地簿了。
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