中文词源
retroactive 有追溯力的
retro-,向后，往回，active,有效力的。
英语词源
- 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.
权威例句
- 1. The seagulls swirled in aerial combat over the barges.
- 海鸥盘旋在驳船上方，展开空中的搏斗。
- 2. a flock of seagulls
- 一群海鸥
- 3. Seagulls followed in the wake of the huge ship.
- 海鸥尾随于大船之后.
- 4. The seagulls were wheeling in the air above the ship.
- 海鸥正在船上面盘旋.
- 5. There is a seagull perched atop the mast.
- 有一只海鸥停歇在桅杆上.