at one's convenience

1. 就某人方便
   You can do it at your convenience.

   你可以在方便的时候做。

at your earliest convenience

1. 在你方便时尽早（商业书信用语）
   Please reply at your earliest convenience.

   请尽早回信。

make a convenience of sb.

1. 利用某人
   Do you really think I'm making a convenience of you?

   你真的认为我在利用你吗？

• at one's convenience
  when or where it suits one.
• at one's earliest convenience
  as soon as one can without difficulty.