at leisure

1. 有空的
   I am seldom at leisure.

   我難得有空。

2. 從容地
   He walked around the town at leisure.

   他從容不迫地在鎮上各處走走。

at one's leisure

1. 閒暇時；有空時；從容地
   Please come and visit us at your leisure.

   有空請來我們這裡做客。

wait sb.'s leisure

1. 等到某人有空時
   Don't hurry, I can wait your leisure.

   別急，我可以等到你有空的時候。

• at leisure
  
  1. not occupied; free.
  2. in an unhurried manner.
• at one's leisure
  at one's convenience.
• lady (or man or gentleman) of leisure
  a person who does not need to earn a living.