Where in Hainan is Hainan dialect more standard?

Hainan is a society composed of immigrants. Hainan Island was originally uninhabited. About 3000 years ago, a branch of the ancient Baiyue nationality crossed the Qiongzhou Strait from Guangdong and Guangxi to Hainan Island. This is the ancestor of the Li nationality today. Later, Han, Miao, Hui and other ethnic groups moved to Hainan one after another, gradually forming a multi-ethnic settlement in Hainan today. After historical evolution, some characteristics of various ethnic groups are constantly being assimilated, but dialects, as the most basic characteristics of this nation, have been preserved and continued from generation to generation. Formed many Hainan dialects today. Hainan dialect belongs to Minnan dialect of Sino-Tibetan language family, which is spoken by more than 5 million people in the province, accounting for about 80% of the total population of the province. This is the most widely used dialect in Hainan. Mainly distributed in the coastal areas of Haikou, Qiongshan, Wenchang, Qionghai, Wanning, Tunchang, Chengmai and other cities and counties. In different places, the pronunciation and tone of Hainan dialect are different, but they can generally talk to each other. Wenchang dialect is usually used as the standard pronunciation in Hainan dialect, as well as the standard pronunciation of Hainan dialect broadcast by radio and television stations and Hainan dialect announcers recruited for the exam. Hainan's traditional Qiongju opera is also sung with Wenchang accent. Hainan dialect has a unique set of inspiratory sounds (or "inward blasting sounds") [b