noun ダウンロード 🔗共有 シダ Any of a group of some twenty thousand species of vascular plants classified in the division Pteridophyta that lack seeds and reproduce by shedding spores to initiate an alternation of generations. Examples : "The forest floor was covered in lush green ferns. " 森の地面は緑豊かなシダで覆われていた。 plant biology nature organism environment science ecology AIとチャット語彙ゲーム読解練習
