The character was obviously wrong but he didn't pick it out. It shows how careless he was. 这么明显的错字他都没看出来,可见他很粗心。
Only a few students passed the exam, so you can see that the paper must have been extremely stiff. 只有几个学生通过了考试,可见考题是很难的。
牛津高阶第八版
美国韦氏词典
Dictionary.com
Free Dictionary
维基百科 (自由的百科全书)