“valid duration”可以造什么句，valid duration造句

2、Revising, writing or assisting in writing teaching materials without demanding any financial request during the valid duration of this contract.

1、Please enter a valid duration. Example: For 1 hour 30 minutes enter 0130 or 130

3、If the valid duration of the patent right expires or the patent right is declared invalid, the patentee may not conclude a patent exploitation license contract relating to that patent with others.