I use the term "low-tier" cautiously, because GSU is a well-regarded research institution that attracts high quality professors and faculty from all over the country.
2018年6月六级真题(第三套)阅读 Section B
柯林斯高阶英汉双解学习词典释义
ADJ-GRADED
谨慎的;慎重的;小心的
Someone who is cautious acts very carefully in order to avoid possible danger.