河川工学
river engineering; hydromodification
preventative measure; precautionary measure
one who believes in a religion; a believer
海胆, 海栗: sea urchin, hurcheon / 雲丹: the roe from sea urchin served as food
He is known as an expert in river engineering.
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DiQt（ディクト）
無料
★★★★★★★★★★
