Data expansion:

Hanyu Pinyin is a Latin Pinyin scheme for Chinese characters promulgated by People's Republic of China (PRC), which refers to the phonetic syllables of standard pronunciation of Mandarin in modern Chinese, and consists of letters and spellings specified in the Hanyu Pinyin scheme.

1955 ——1957 was studied and formulated by the Chinese Pinyin Scheme Committee of the former China Language Reform Commission (now the State Language Commission).

This pinyin scheme is mainly used to mark the pronunciation of Putonghua and Chinese as the phonetic symbol of Chinese characters. The National People's Congress1958 February 1 1 approved the announcement of the plan. 1982, which became the international standard ISO7098 (Chinese Roman alphabet spelling). Some overseas Chinese areas, such as Singapore, use Chinese Pinyin in Chinese teaching.

Chinese Pinyin is a tool to assist Chinese pronunciation. Article 18 of the General Language and Characters Law of People's Republic of China (PRC) stipulates: "The Chinese Pinyin Scheme is a unified standard for spelling Roman letters in Chinese names, place names and Chinese documents, and it is used in areas where Chinese characters are inconvenient or unusable." The symbols written according to this set of norms are called Chinese Pinyin.

Chinese Pinyin is also an internationally recognized modern standard for Latin transliteration of Chinese. The international standard ISO7098 (Chinese Roman alphabet spelling) writes: "The Chinese Pinyin Scheme officially adopted by the people of China and the National People's Congress of China is used to spell Chinese. The author records the pronunciation of Chinese characters in Mandarin. "

In ancient China, Chinese characters were used as the carrier, and they were annotated by methods such as orthography and anticlockwise. Direct pronunciation means using homophones to express the pronunciation of Chinese characters. If homophones are all rare words, even if they are pronounced, they can't be read.

Backcutting refers to annotating another Chinese character with two Chinese characters. The upper word is the same as the initial consonant of the annotated word, and the lower word is the same as the vowel and tone of the annotated word. Mr. Zhou Youguang called reverse cutting "center cutting welding method". These two methods of phonetic notation are inconvenient to use.