When an abbreviation has become so common that it has supplanted the full name in common usage, one may use the abbreviation;
如果一个缩写的应用已经非常普遍，在一般用法中已经取代了全称，则可以使用缩写；
When an abbreviation has become so common that it has supplanted the full name in common usage, one may use the abbreviation;
如果一个缩写的应用已经非常普遍，在一般用法中已经取代了全称，则可以使用缩写；
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