学术报告里must 和have to的不同用法
To update product data,at first we must open the A-Project containing the product data we want to change.Then we should select the product data and check them out.After we can change these product data and the changed product data must be checked in again.Finally we must publish these updated data to TCNG.
这里3个都是must,该不该改成have to.
是不是必须得该？