问题描述：
A plane is a machine that can fly.(指一类人或事,相当于a kind of)
A plane is "a" machine that can fly.(指一类人或事,相当于a kind of)
In many places in China,"the "bicycle is still a popular means of transportation.（
表示某一类人或物
）
这两句中 为什么第二句用“the”?不是也指一类物吗?
A plane is "a" machine that can fly.(指一类人或事,相当于a kind of)
In many places in China,"the "bicycle is still a popular means of transportation.（
表示某一类人或物
）
这两句中 为什么第二句用“the”?不是也指一类物吗?
问题解答：
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