[, ]a service provided for the public, for example an electricity, water or gas supply 公用事业◆the administration of public utilities 公用事业管理
[] a company that provides a service for the public, such as electricity, water or gas 公用事业公司◆the world's largest private electricity utility 全球最大的私营公用电力公司
() [] a piece of computer software that performs a particular task 应用程序◆an anti-virus utility 反病毒应用程序
() [] the amount of benefit or satisfaction that sb gets from using a product or service 效用；实用性◆Water has high utility but low commercial value. 水具有很高的实用性，但商业价值很低。