46. certain adj. 肯定的,确认的Im ~that/It is ~that
positive adj. 确定的,确信的,肯定的sure adj. 一定的,有把握Im ~ that
47. certainly adv. 当然,无疑
surely adv. 肯定,定然会
48. chance n. ,机会by~ 偶然/意外地
occasion n. 时机,机会by~of 由于
opportunity n. 良机,机遇
49. character n. 总特征
feature n. 特征,脸面特征,五官
characteristic n. 特征,特点
property n. 属性
50. cheat v. 而欺骗,骗取;作弊
deceive v. 欺骗,诱骗
fool v. 愚弄,哄骗
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