function value短语⁸⁴³²⁰⁺⁸ 基本例句 函数值 According to characteristics of water resource, two kinds of aquatic ecosystem services were identified in this paper: economic benefit value and ecological function value. 根据水资源生态系统提供服务的特点，将水资源生态系统服务功能分为经济服务功能和生态服务功能。 cnki