backdate
v [Tn] declare that (sth) is to be regarded as valid from some date in the past 宣布(某事物)自过去某日起即为有效
a pay increase awarded in June and backdated to 1 May 6月份发放的从5月1日算起的增薪.
🗣️ 情景例句
So long.
再见。
A servant is known by his master's absence.
主人不在可以看出仆人的品行来。
Long car journeys are even less pleasant, for it is quite impossible even to read.