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每日一句口语:
A doubtful friend is worse than a certain enemy.
可疑的朋友比确定的敌人更可怕。
【知识点讲解】
doubtful adj.难以预测的; 难以预料的,未定局的; 怀疑的,拿不准的; 不明不白
例句:For a time it seemed doubtful that he would move at all. 有一段时间他似乎根本不会搬家。