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月六級真題（第二套）閱讀 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月六級真題（第二套）聽力 Section C
柯林斯高階英漢雙解學習詞典釋義
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.