您要查找的是不是：
- The newly hewn steps were too narrow to tread in comfort. 新砌的石级窄窄的，搁不下整脚。
- To tread in air 得意洋洋
- Fools rush in where angels fear to tread. 天使裹足不前，愚人轻举妄动。
- Designed to operate on land, water, or in air. 长于陆海空作战的，三栖的可在陆上、水上或空中操作的
- Fools rush in where engels fear to tread. 天使不敢行走处,傻子一步冲进去。
- The crew of the capsized yacht had to tread water until the rescuers arrived. 那艘快艇倾覆了，人们在营救人员到达以前只得踩水。
- He sucked in air, then went under the water again. 他深深吸了一口气又潜到水里。
- The sky is too high to see the birl flying in air. 没人知道在哪个时候没有东西可以看了会非常无聊。
- I don't want to tread on anybody's toes so I won't say what I think. 我谁也不想得罪，所以我不把想法说出来。
- Careful you don't tread in that puddle. 小心，别踩着那水坑。
- Or tread in the bus on my tose ? 还是会给我一脚踩到公共汽车时出现？
- We have a delicate path to tread. 我们面前的道路十分微妙。
- Mind you don't tread in that puddle. 小心; 别踩着那水坑.
- How much does sound travel faster in water than in air? 声音在水中比在空气中传播快多少？
- It is a fine line for men to tread. 这对男人来说一个很好的消息。
- Make the way hard for the seeker to tread. 使得为搜索者踩踏的道路艰难。
- The speed of sound in water is about four as great as in air. 声音在水中的速度是空气中的四倍左右
- Lomas needed to tread carefully. 洛马斯需要谨慎行事。
- Exhaust gas has been incriminated in air pollution in cities. 废气已过视为城市空气污染的原因。
- Hey! Careful not to tread on that flower. 哎！别踩了那朵花。
