The salary increase will be retroactive to January, so staff will receive back pay.

這次加薪將追溯至一月生效，所以員工會領到補發的薪資。

Our insurance policy does not allow retroactive coverage for claims filed before enrollment.

我們的保單不提供投保前申請理賠的追溯保障。

The airline announced a retroactive refund for passengers affected by last month's fee change.

航空公司宣布，受上個月費用調整影響的旅客可獲得追溯退款。