I don't know what this word means.(为什么“mean”要加“s”)
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I don't know what this word means.(为什么“mean”要加“s”)
I don't know what this word means.(为什么“mean”要加“s”)
I don't know what this word means.(为什么“mean”要加“s”)
mean是动词,而前面的this word是单数,所以动词应用单三式