backdate
v [Tn] declare that (sth) is to be regarded as valid from some date in the past 宣布(某事物)自過去某日起即為有效
a pay increase awarded in June and backdated to 1 May 6月份發放的從5月1日算起的增薪.
??? 情景例句
I need some help.
我需要幫助。
Many hands make light work.
人多好做活。
It is a very modern house, so it looks strange to some people.