訓 か ・ 音 ブン
Sino-Vietnamese: văn
Insect 虫 gives the meaning and 文 (bun) gives the sound, like the buzzing of a mosquito.
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夏は蚊が多くて困る。 (なつはかがおおくてこまる)
There are so many mosquitoes in summer, it's a nuisance.