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
英语四级真题
A study by the University of Manchester calculated the emissions of CO2—the main greenhouse gas responsible for climate change—at every stage of microwaves, from manufacture to waste disposal.
2019年12月四级真题（第一套）阅读 Section C
There's a high-tech underground trash disposal system.
2019年12月四级真题（第一套）阅读 Section B
英语六级真题
Typically, parents have fewer technological resources at their disposal than do schools.
出自-2013年12月听力原文
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.