Japanese · Pronunciation Guide
yo-ru, two short beats — a fixed o, one tap, and completely flat lips on the u.
yoru
Two slots of equal size, and standard speech leaves the word unaccented — so the pitch rises from yo to ru and stays up, keeping a following particle high. Neither beat is the word's centre of gravity.
Listen: 夜
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夜は町がとても静かです。
Yoru wa machi ga totemo shizuka desu.
At night the town is very quiet.
Listen: 夜は町がとても静かです。
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夜は町がとても静かです has 町 (ma-chi) with a light affricate and 静か (shi-zu-ka) whose opening shi can devoice. So after two clearly-voiced beats in 夜, the sentence moves through an affricate and a whispered vowel — a good survey of textures at one steady tempo.
"YO-roo" glides the o, stresses the first beat, curls the r and rounds the u. Freeze the vowel, tap the tongue once, and spread the lips. Because the word is only two morae, every one of those errors is proportionally large — a mispronounced よる is unrecognisable in a way a mispronounced five-mora word wouldn't be.