useful是什么意思

用法例句

This text comes down to examine "useful mathematics" closely from the visual angle of mathematics culture.

本文从数学文化的视角下来审视“有用的数学”。

“To study useful geography”is the new turn of geography curriculum reforms and places it in the first place,which is an idea that this geography cirriculum reforms most emphasized.

“学习有用的地理”是新一轮地理课程改革放在首位的理念,是这次地理课程改革中最强调的理念。