| 单词 | retroactive |
|---|---|
| 音标 | [retrəu'æktiv] |
| 解释 | adj. 溯及既往的，有追溯效力的 |
| 红宝书 | 【例】 The new law was made retroactive to 1 January. |
| 字源 | retroactive (adj.) 1610s, from French rétroactif (16c.) "casting or relating back," from Latin retroact-, past participle stem of retroagere "drive or turn back," from retro- "back" (see retro-) + agere "to drive, set in motion" (see act (v.)). Related: Retroactively. |
| 不择手段背单词 | 无 |
| 趣味全助记 | 【记】retro反 act作用 |
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