| 单词 | up and down |
| 释义 | ● ˌup and ˈdown 🔑 moving upwards and downwards 起伏；上下波动◆ The boat bobbed up and down on the water . 小船在水面颠簸。🔑 in one direction and then in the opposite direction 来回；往复◆ She was pacing up and down in front of her desk . 她在办公桌前踱来踱去。sometimes good and sometimes bad 时好时坏◆ My relationship with him was up and down . 我跟他的关系忽冷忽热。(NAmE , informal ) if you swear up and down that sth is true , you say that it is definitely true 绝对地；肯定地；完全地See also up |
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