at leisure

1. 有空的

I am seldom at leisure.

我难得有空。

2. 从容地

He walked around the town at leisure.

他悠闲地在镇上四处走走。

at one's leisure

1. 在空闲时

Please come and visit us at your leisure.

有空请来我们这里做客。

wait sb.'s leisure

1. 等到某人有空时

Don't hurry, I can wait your leisure.

别急, 我可以等到你有空的时候。