1. Sell goods at rock-bottom prices.
   半卖半送。
2. I was twenty days hacking and hewing at it at the bottom.
   砍断它的根部用了二十天。
3. Cuff:a fold used as trimming at the bottom of a sleeve.
   袖口:在袖子底部用作装饰的折叠部分.
4. a snowy runout at the bottom of the ski slope.
   滑雪下坡底部的雪的弯曲面
5. Carelessness is at the bottom of all great mistakes.
   粗心大意是一切重大错误的根源。

　1个副词解释