It is utterly confusing to me that people do not recognize this, despite the fact that pretty much anyone who has been a student can tell the difference between their best and worst teachers.
2016年12月四級(jí)真題（第三套）閱讀 Section C
英語六級(jí)真題
The open-data shift poses a confusing problem for junior researchers.
2017年12月六級(jí)真題（第二套）閱讀 Section B
柯林斯高階英漢雙解學(xué)習(xí)詞典釋義
ADJ-GRADED
令人困惑的;費(fèi)解的；混亂的
Something that is confusing makes it difficult for people to know exactly what is happening or what to do.