tread sole of shoe 鞋子接触地面的底面部分
I'm the pebble in your shoe, reminding you to tread lightly.
我是你鞋里的鹅卵石，随时提醒你小心行事。
Samples were collected from the upper surface the tread of right foot for each pair of shoe, then inoculated and counted for the colonies.
对每双鞋的右脚上表面和鞋底取样，接种并计数菌落。
All feet tread not in one shoe.
两只脚不能穿一只鞋。
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