任你用

somebody is at your disposal

someone is available to help you I know there is plenty of work to do, so my daughter is at your disposal.

See also: disposal

something is at your disposal

something is available to be used by you The committee has limited resources at its disposal. We have $100,000 at our disposal to provide food for homeless people.

Usage notes: sometimes used in the form at the disposal of someone: More powerful guns are at the disposal of criminals than ever before.

source: http://idioms.thefreedictionary.com/is+at+disposal