To understand the level tone, we must start with the ancient tone. In ancient times, there were four tones: entering the tone from above. Among them, yin and yang are equally divided, that is, flat voice and flat tone.
Now let's talk about Mandarin. Now there are four tones in Mandarin, which goes without saying. Now, one is a Guping tune, two is a rising tone, three is a rising tone and four is a falling tone. So where are the ancient Rusheng characters? Divided into four tones. For example, "Black (one sound) stone (two sounds) cypress (three sounds) falling (four sounds)" used to be an entering tone.
Because the ancients regarded ping as ping, and the upper voice was awkward, so basically Mandarin was flat with one sound and two sounds, and three sounds and four sounds were awkward. In order to distinguish flat tones, modern people must remember all the tones they have entered. Because there are a lot of words with one tone and two tones.
Remember that all entering tones are the basic skills to distinguish flat tones. There are some rules. For example, all vowels with ie ue are entering words. For example, as long as you remember that "white" is Rusheng, you will know that "white, uncle, fear and uncle" are Rusheng characters.
In addition, it is worth noting that, for example, the word "Kan" is a polyphonic word, so there are both flat and flat tones, and the key to distinguish flat and flat tones depends on the meaning of the word.
Extended data:
Couplets, also known as antithesis, antithesis, spring stickers, Spring Festival couplets, couplets, Taofu and couplets (named after the pillars hanging in halls and houses in ancient times), are a kind of dual literature, which originated from Taofu. It is a antithetical sentence written on paper, cloth or engraved on bamboo, wood and columns. It is a unique art form of Chinese, concise and profound, neat and even, with the same number of words and the same structure.
Couplets are the treasures of China traditional culture, and the earliest recorded couplets appeared in the Three Kingdoms period. During the Hongwu period of the Ming Dynasty (1368- 1399), an extra-large iron cross was unearthed in Luling, Jiangxi Province (now Ji 'an City, Jiangxi Province), on which the year number of Sun Quan Chiwu in the Three Kingdoms period (238-250) was cast. On the iron cross, there is also a beautifully made couplet cloud: "The four seas celebrate An Lan, and the iron column leaves a cross; All the people are pregnant with Ozawa, and the golden stove is fragrant for thousands of years. " Its form and content are related to early Christians in China. Spring Festival couplets are called Spring Festival couplets, funeral couplets are called elegiac couplets, and wedding couplets are called violet couplets. Couplets are a national style written by using the characteristics of Chinese characters, and generally do not need to rhyme (only the antitheses in the rhyme need to rhyme).
References:
Baidu encyclopedia-couplets