错误: error, mistake, mistaken, false, wrong...
上班: to go to work, to be on duty, to start work, to go to the office...
切除: to excise, to cut out (a tumor)...
题目: subject, title, topic...
课堂: classroom...
优势: superiority, dominance, advantage...
沼泽: marsh, swamp, wetlands, glade...
头发: hair (on the head)...
胃: stomach...
低迷: blurred (landscape etc), low (spirits), in a slump (economy)...
