n. 功用, 有用之物, 实用, 公用事业, 实用程序
a. 实用的, 有多种用途的
[计] 实用程序, 工具
英文释义
n. a company that performs a public service; subject to government regulation
n. the quality of being of practical use
n. the service (electric power or water or transportation) provided by a public utility
n. (economics) a measure that is to be maximized in any situation involving choice