Japanese · Pronunciation Guide
shi-ma-ru, three even beats — a thin hiss, an open a, and a single tap.
shimaru
Peak on ma, and three slots of matching size. This intransitive verb pairs with 閉める (shimeru); both are three beats, and the only audible difference is a single vowel in the middle. That makes clean vowel quality more than a cosmetic matter here.
Listen: 閉まる
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博物館は今日閉まっています。
Hakubutsukan wa kyou shimatte imasu.
The museum is closed today.
Listen: 博物館は今日閉まっています。
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博物館は今日閉まっています uses 閉まって, where the ru becomes a geminate: shi-ma-t-te, four morae with a beat of held silence. 博物館 at the front is five morae (ha-ku-bu-tsu-ka-n — six, in fact) with a devoicing-prone ku and an affricate. The sentence is a long one, and the silence in the middle of the verb is easy to skip.
First attempts land on "shee-MA-roo": a long first vowel, English stress in the middle, and a rounded rhotic ending. Cut the i short, level the beats, tap once, and spread the lips for the u. The sh also needs lightening — English pushes far more air through it than Japanese does.