available for one to use whenever or however one wishes由某人随意使用
at someone's disposal
ready to assist the person concerned in any way they wish供某人支配
柯林斯高阶英汉双解学习词典释义
PHRASE
任…处理;供…任意使用;由…自由支配
If you have something at your disposal, you are able to use it whenever you want, and for whatever purpose you want. If you say that you are at someone's disposal, you mean that you are willing to help them in any way you can.