-brush up on : 重新學習或複習..
ex: brush up on chemistry, brush up on the language
-brush down: 用刷子刷乾淨 或用手拍乾淨
-brush off: 不重視, 漠視, 不理睬
ex: He brushed off all our suggestions.
-pave the way for : 為...鋪路
ex: Such opinions pave the way for social change.
- dog-eat-dog : 狗咬狗的; 無情的; 自相殘殺的
