" Micro" means very small, and in the case of Twitter, you are essentially blogging something up to 140 characters – that's 140 letters, numbers, symbols, and spaces.
“微” 意味着非常小， 在 Twitter 的情况下，您实际上是在写最多 140 个字符的博客——即 140 个字母、数字、符号和空格。
Number symbol
原声例句
2010 English Cafe
英语百科
Number sign
This is an article on the symbol #. The official name of the symbol is contested; it is most commonly known as a number sign, hash, hash sign, pound, or pound sign. Other names include octothorpe and hashtag. The symbol is used for a variety of purposes, including the designation of a number (for example, "#1" stands for "number one"), an abbreviation for pounds avoirdupois in the food industry, a searchable metadata tag on social media platforms, and a button on telephone keypads. The symbol is defined in Unicode as U+0023#NUMBER SIGN (HTML # ·as in ASCII).
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