[ U ] used to represent a number, or the name of person or thing that is not known or stated未知(或未指明)的数(或人、事物)
[ C ] plural x's used at the end of an informal piece of writing to represent a kiss(用于非正式文体末尾,表示亲吻)
[ C ] plural x's written on an answer to a question to show that the answer is not correct(表示答案错误的标记)
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