Part 5 品詞 ／ タイプ: 品詞難易度: ★★
ゲスト: 本日の残り 10 / 10 問 ・ アカウント作成で進捗を保存
The backup generator supplies emergency power even when the main grid experiences an unexpected outage.
The backup generator supplies emergency power even when the main grid experiences an unexpected outage.