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adv. must, certain
Chinese Paragraph.
好,我 一定 来。马丁,你 今年 多大? OK, I must come. How old are you this year, Martin? 他 才 三 岁,还 小 呢,一定 得 早 睡觉。 He is only three years old, and still young, he must go to bed early.
Chinese Character.
一 定