It's a proper time to start it when a unit is over.

一个单元结束时是开始这件事的合适时间。

youdao

I'll clarify my stand at a proper time.

我将在合适的时候澄清我的立场。

youdao

There is a proper time for every activity.

每项活动都有适当的时间。

youdao

Republican lawmakers say Democrats are trying to push through a bill without enough time for proper Congressional scrutiny.

VOA: standard.2009.07.29

There will be a proper time to discuss such things.

FORBES: Roof Collapse Could Be End Of NFL In Minnesota

Mr. ANTHONY HAMILTON (Musician): There's a proper time and place for everything, and once you put so much time into it, you'd be a fool to turn around and walk away from it, 'cause I tasted it.

NPR: Anthony Hamilton: 'Ain't Nobody Worryin'

When he was working for him when the president was governor of Texas and certainly at the White House and now as the attorney general of the United States, he has done I think a very, very good job, and at the same time maintained a proper sense of loyalty to the president of the United States, the person at whose pleasure he works.

NPR: Political Corner: Gonzales