noun ダウンロード 🔗共有 単孔類 A mammal that lays eggs and has a single urogenital and digestive orifice. Only the echidnas and platypuses are included in this group Examples : "In their biology class, the students learned that monotremes, such as echidnas and platypuses, are unique mammals because they lay eggs instead of giving birth to live young. " 生物の授業で、生徒たちはハリモグラやカモノハシのような単孔類は、生きた子供を産む代わりに卵を産むため、ユニークな哺乳類であることを学びました。 animal biology organism nature AIとチャット語彙ゲーム読解練習