求翻译：And it requires tremendous linguistic economy(语言省略). There is neither time nor space for explanation. Why consume precious key-stoke (键盘敲击) telling six friends you have to leave for a moment to take care of your little brother when BRB(=be right back) will do?是什么意思？

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And it requires tremendous linguistic economy (language abbreviation). There is neither time nor space for explanation. Why consume precious key-stoke (keyboard rap) telling six friends you have to leave for a moment to take care of your little brother when BRB (=be right back) will do?

And it requires tremendous linguistic economy (language is omitted). There is neither time nor space for explanation. Why consume precious key-Stoke (keyboard percussion) telling six friends you have to leave for a moment to take care of your little brother when BRB (=be right back) will do?