Japanese · Pronunciation Guide
se-ka-i, three beats — the ka and i are separate morae, not the English word "sky" backwards.
sekai
Crest on the first, and three units of the same length. The word shares the -ai ending of dozens of others, and in every case that i is a separate beat rather than the second half of a diphthong — get it right here and a whole family follows.
Listen: 世界
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世界にはたくさんの国があります。
Sekai ni wa takusan no kuni ga arimasu.
There are many countries in the world.
Listen: 世界にはたくさんの国があります。
Free browser voice. Hear it read by a real native speaker inside the LingoDrop app.
世界にはたくさんの国があります includes たくさん (four morae with a whispered ku and a closing nasal) and 国 (ku-ni). So after 世界's three plain beats, the sentence hands you a whispered vowel, a nasal beat and then a palatalised n — a good sequence of contrasting textures.
"se-KIGH" fuses the last two morae into an English diphthong and stresses them. Pull them apart with a separate pulse on the i. The opening e also tends to drift toward "say" — anchor your tongue for its whole duration, and keep all three beats the same length.