“徒劳的”造句

假装系统完美无疵是徒劳的。
It would be idle to pretend the system is perfect.

祈祷天气转变是徒劳的.
It's no use praying for the weather to change.

他们想方设法地使她高兴, 但那是徒劳的.
They endeavored to make her happy, but in vain.