六级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.

由于社会或学术义务，地方合作有时会持续到有用的程度，而国际合作则可以更自由地培养和放弃。

2019年6月六级真题（第二套）听力 Section C

六级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.

皇后学院政治学教授安德鲁·哈克（Andrew Hacker）认为，高等代数和其他更高层次的数学应该从课程中删去，而改为更实用的课程，如统计学。

2018年12月六级真题（第二套）阅读 Section C

考研The question of GDP and its usefulness has annoyed policymakers for over half a century.

半个多世纪以来，GDP及其效用问题一直困扰着决策者。

2017年考研阅读原文