• 索引suǒ yǐn index; reference; indexing; X
• 未知因素wèi zhī yīn sù X factor
• 限制级电影xiàn zhì jí diàn yǐng X-film

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at once, at one stroke, at one time, at present, at random, at regular intervals, at school, at sea, at six, at stake,

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3G, 401(K), a,

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at the front of, at the head of, at the instance of, at the last moment, at the latest, at the least, at the mercy of, at the moment, at the most, at the opposite extreme,

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3G, 401(K), a,

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at the weekend, at the word of command, at the worst, at this time of year, at times, at variance, at war, at weekends, at will, at work,

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3G, 401(K), a,