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 garden was shaded by a large fern, its delicate leaves unfurling in the damp air. " 庭は大きなシダによって日陰になっており、その繊細な葉が湿った空気の中で開いていた。 plant biology nature environment organism AIとチャット語彙ゲーム読解練習
