Andrew Hacker, Queens College political science professor, thinks that advanced algebra and other higher-level math should be cut from curricula in favor of courses with more routine usefulness, like statistics.
2018年12月六级真题（第二套）阅读 Section C
Whereas local collaborations sometimes persist past the point of usefulness because of social or academic obligations, international ones can be cultivated and dropped more freely.
2019年6月六级真题（第二套）听力 Section C
柯林斯高阶英汉双解学习词典释义
ADJ-GRADED
有用的；可用的；有助益的
If something is useful, you can use it to do something or to help you in some way.