Mobile phones are a boon for people.
The mobile phone is a boon for people.
A mobile phone is a boon for people.
请问老师三句话是否都正确吗?如何理解冠词和前面名词复数之间的关系?
可以参考“英语语法网”的下面这篇文章(第1条):
http://www.yygrammar.com/Article/201908/5484.html
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