LingoNeko

一定
adverb

definitely, necessarily

A2

definitely, necessarily

yídìng

A2Elementary

A2

這份報告一定要在星期五之前交出去。

This report must be submitted before Friday.

A1

騎機車一定要戴頭盔。

You must wear a helmet when riding a scooter.

B1

外國旅客買到一定金額可以辦退稅。

Foreign visitors can apply for a tax refund after spending a qualifying amount.