1. The vocal cords do not need to vibrate when W is pronounced. The vocal cords need to vibrate when V is pronounced.

2. When W is pronounced, it is pronounced by friction between the airflow and the upper and lower lips of the mouth. The voiced w sound is not pronounced as o. When pronouncing V, place your upper teeth gently on your lower lip. The voiced consonant v is not pronounced u.

3. When W is pronounced, the mouth is rounded and the lips are raised, similar to the Chinese character "oh". When pronouncing V, gently bite half of your lower lip with your upper teeth, and then blow out the air.

Extended information:

Strict phonetic notation

To record a voice, the initial method should be strict phonetic notation. The so-called strict phonetic notation means that phonemes are recorded whenever they appear, and accompanying phenomena are recorded whenever there are accompanying phenomena. No phonemes or accompanying phenomena are spared, which is the most faithful and detailed recording of the original appearance of speech.

Therefore, strict phonetic notation is also called "phonetic notation". For example, in modern Chinese, the lower lingual surface vowel can be summarized as one phoneme /a/. If strict phonetic notation is used, it must be marked as [ε], [?], [a], [ɑ], [ respectively. ?],[?]wait. Its characteristic is that every phoneme that actually exists in a language or dialect (regardless of whether they belong to the same phoneme) is marked with a specific phonetic symbol.

Therefore, strict phonetic notation uses many phonetic symbols and describes the pronunciation in detail. It is mostly used when investigating first-hand materials, and only occasionally in other situations. Strict phonetic symbols are represented by square brackets.

Wide-style phonetic notation

The so-called wide-style phonetic notation is to sort out a phonetic system of speech based on strict phonetic notation, and then mark the sounds according to phonemes. That is to say, only phonemes are recorded, and phoneme variants and other non-essential accompanying phenomena are not recorded. Therefore, wide phonetic notation is also called "phonemic phonetic notation".

For example, in modern Chinese, there are many tongue-low vowels such as [ε], [?], [a], [ɑ], etc., and only /a/ can be used for wide-form notation. . Using wide-form phonetic notation can limit the number of phonetic symbols within a limited range, thus reflecting the phonological system of a language or dialect concisely and clearly. Broad phonetic symbols are represented by slashes.

Reference material: Baidu Encyclopedia--International Phonetic Alphabet