If you don't know the pronoun "XX", you can use the word XX instead. Or words that are not easy for others to know, you can use XX instead. Another is that if the internet is uncivilized, you can also use XX instead. A few people came again to express their thanks. "You are too xx(chacha)" sometimes means "You are awesome X". In addition, the abbreviation of Star Game Network, the largest game auxiliary base in China, is also called XX(xxwg). The reason is that the unknown equations in mathematics are replaced by X, so everyone uses X instead of these things. You can also use XX for riddles or brain teasers, such as Xiaobai+Xiaobai =XX and XX= Rabbit. The application of XX in application life comes from the fashion language of the Internet, and it is often used to refer to something, especially when it is inconvenient to say what it refers to, and it can also be used to refer to vague things. XX has another meaning. In western countries, when a girl leaves a message for her beloved boy, she will also use XX at the end of the message, which means kissing. To show my love for this boy. Mathematical application in mathematics, as the application of unknown X network. Now this word appears frequently in the network, especially after some games have blocked swearing, XXOO has become synonymous with players swearing. And some people who don't like swearing and explicit use XXOO to vent their dissatisfaction. In the novel, XXOO means that it is not convenient for the hero and heroine to confess directly when they have sex, or it is not convenient to confess directly when they swear. In the online game StarCraft, XX is the abbreviation of Berserker. Now the word XX often appears in mobile phone post bars on the Internet. In fact, the word "crack" has been blocked, and it often appears in the post bar that you can run any program to XX your mobile phone. It means that you have improved your permissions, and you don't need to import certificates to install any software that used to require certificates. The application of biology in biology shows that human cells have 23 pairs of chromosomes, which are divided into 22 pairs of autosomes and 1 sex chromosomes. Sex chromosomes determine the sex of an organism. There are two kinds of sex chromosomes, namely XX and XY, where XX is female and XY is male.