you must be very careful meaning in Chinese
不可不慎也
Examples
- You must be very careful .
不可不慎也。 - No matter what you do , you must be very careful
不管你做什么事，你都必须非常细心。 - Who is the one that you must be very careful of
所以你必须非常小心他 - Who is the one that you must be very careful of
所以你必须非常小心他 - Most of the chinese people wear it just indorrs , so it seldom needs washing . but once you wash it , you must be very careful
大多数中国人都在室内穿。所以就很少洗它，但一定你要洗它，你必须得小心。