retroactive

• adj. 追溯的；有追溯效力的；反動的

retro-,向後，往回，active,有效力的。

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.

1. The seagulls swirled in aerial combat over the barges.

海鷗盤旋在駁船上方，展開空中的搏鬥。

來自柯林斯例句

2. a flock of seagulls

一群海鷗

來自《權威詞典》

3. Seagulls followed in the wake of the huge ship.

海鷗尾隨於大船之後.

來自《簡明英漢詞典》

4. The seagulls were wheeling in the air above the ship.

海鷗正在船上麵盤旋.

來自《現代漢英綜合大詞典》

5. There is a seagull perched atop the mast.

有一隻海鷗停歇在桅杆上.

來自《簡明英漢詞典》