訓 ま(す),ふ(える),ふ(やす) ・ 音 ゾウ
Sino-Vietnamese: tăng
Earth 土 for meaning; 曽 (layers piled up) gives the sound zou and the image. Pile soil layer on layer and the mound increases. Think zouka, an increase.
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人口が増えています。 (じんこうがふえています)
The population is increasing.