1. We heard his heavy tread on the staircase.
   我们听到了他走在楼梯上沉重的脚步声。
2. There's no tread on this tyre-you should put on a new one.
   这轮胎胎面花纹已被磨平-你应该换一个新的。
3. He accidentally trod on her foot.
   他不小心踩了她的脚。
4. Please do not tread on my toes.
   请勿踏在我的脚趾上。
5. I trod on his foot By accident.
   我偶然踩了他的脚。

　1个动词解释