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Printing the screenshot above, we can see that the subscriber receives every message from the publisher. However, for Xiao Hong, she only wants to receive messages with red color and does not want to receive messages with black color. Therefore, we need to make the following modifications to the code. We can first add a key so that the subscriber can only subscribe to messages of interest to herself. The code is as follows:苏文青见他谈笑间有了以往的味道，遂放下心来，用手敲了他脑门一下，笑骂道：早知道我就不费这番口舌了。其次视距离远近，先救离自己近的人，然后再救另一人。B Delete useless dimensions, labels, characters, axes, etc. All things that have no effect in modeling will be deleted, all kinds of drawings will be exploded, and all line types and line widths will be changed to default.廖惊北等一批共产党人在陕甘边地区出生入死浴血奋战，从建立小股游击队开始，一步步壮大为主力红军并建立了照金、南梁红色根据地。他们在强大的白色势力的包围下，粉碎了敌人一次次的围剿，屡战屡败、屡败屡战，演绎了一幕幕传奇而悲壮的故事。最后壮大了红军队伍，建立了陕北红色根据地，为迎接中央红军到达陕北做出了巨大的贡献。廖惊北和颜显鸿是一对红色恋人，在艰苦卓绝的年代生生死死，几次离散，最终在敌人炮火之中隔河结为夫妻，结婚仪式刚结束，廖惊北就带领战士冲向前线。隋朝中叶，北方突厥人进犯中原，边关危机，朝廷急召老军武赶赴边关。花老将军因多年征战已无力再穿战袍，但为报效国家欲带病出征。情急中女儿木兰决定女扮男装替父从军。深夜木兰盗军帖，女扮男装离家出征。途中结识了孙、刘、周三位义士共赴边关。贺元帅之女贺红儿对这位英俊“少年”心旗摇曳。善良憨厚的青年黑丑，羡慕花木兰的美丽和高超的武功，见花木兰改装出走唯恐木兰一去多有不便，毅然追随木兰从军，最终为掩护木兰中箭身亡。花木兰智勇双全，率大隋将士奋勇杀敌，赢得一次次胜利，副帅李不忌由于嫉妒，暗箭射伤木兰。贺红儿在病床前精心照料着心中的“恋人”，木兰不得已将自己的女儿身事告之红儿，红儿又惊讶又感到无限悲伤，花木兰高奏凯旋荣归故里，李不忌知花木兰是女性，羞愧不已，悔恨难当，他跪在花家门外，愿此生做花家奴仆以赎罪身。