to tread on air 洋洋得意
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。
And Edmund went in, taking great care not to tread on the Wolf's PAWS.
于是爱德蒙走了进去,小心翼翼地,注意不踩到狼爪子。
Having warned the tourists not to tread on the troughs, Tan continued with his work.
提醒游人不要踩踏盐槽后,谭孟福继续低头修补盐槽。
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