noun ダウンロード 🔗共有 テトラ Any of numerous species of small South American freshwater fish of the family Characidae, popular in home aquariums. Examples : "My daughter's aquarium is full of colorful tetras and a few guppies. " 娘の水槽は色とりどりのテトラと数匹のグッピーでいっぱいだ。 fish animal biology AIとチャット語彙ゲーム読解練習