IThat is a very interesting question.

Geographically speaking, Hainan is just an island, and not thepart of mainland of China.

But when you say it threference mainland of China, you are saying this frompeaking about the political system angle,entity and you are differentiating it from Taiwan, Hong Kong, and Macao.

I think more people better say Hainan island is thepart of mainland of China, which means the territory that is under the control of the CCP, and implement a socialist system is implemented there.

So whether or not it is reallygeographically part of the mainland becomes less important.

Although Hong Kong and Macao now areare now also under the control of the CCP, they used to be colonies, and implement a capitalist system, is implemented in them; so, you can’t say them they are part of mainland of China.

All the above are my opinions aboutThis is my opinion with regard to your question.

Geographically speaking, Hainan is justonly an island, and not the mainland of Chinapart of China's mainland.

ButHowever, when you say it therefer to mainland of China, you are saying this from the political system angle, and you are differentiating it from Taiwan, Hong Kong, and Macao. from the standpoint of the political system.¶

I think people better say People ought to use the phrase "Hainan iIsland is the mainland of China," which means the territory that is under the control ofdenotes the region governed by the CCP, and implementnstitute a socialist system., in my opinion.¶

Although Hong Kong and Macao now are also under the control of CCP, they used to bare now also governed by the CCP, you cannot refer to them as being part of the Chinese mainland because they were once colonies, and implementuse a capitalist system, so you can’t say them the mainland of China.¶

All the above are my opinions about your questRegarding your question, the aforementioned is my opinion.¶