Japanese · Pronunciation Guide
su-shi, two beats — both vowels typically devoice, so it comes out closer to "s'shi."
sushi
Two slots, both often voiceless. The word is a good test of whether you're timing or just hearing: a native 寿司 has almost no vowel in it, yet takes exactly as long as any other two-mora noun. English speakers who voice both vowels make it sound heavy and slow.
Listen: 寿司
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今晩は寿司を食べます。
Konban wa sushi o tabemasu.
Tonight I'm eating sushi.
Listen: 今晩は寿司を食べます。
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今晩は寿司を食べます opens with 今晩 (ko-n-ba-n), four morae with two nasals — the first assimilating to an m before the b. So a word made mostly of hiss follows one made largely of hum, and both need their beats counted rather than heard.
The English borrowing "SOO-shee" has two long rounded vowels and a stress peak; the Japanese word has neither. Spread the lips, let both vowels devoice, and keep the two beats equal. The s and sh are also different sounds here — the first tip-based, the second blade-based — and English speakers tend to make them identical.