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Hey, pinyin and word formation. Hey, how to pronounce it?

1, the pinyin of Hey is hēIēmù.

2, hehe [hēi], hehe onomatopoeia, describing laughter; Sigh, make sentences: Hehe, after listening to this cold joke, the students still laughed; Hey, hey, watch your step.

3, hey [mi], don't say "mo", don't make any noise, make a sentence: after listening to his explanation, I bowed my head.