To be usefulとは 意味・読み方・使い方 - Weblio to be useful―of use―serviceable―of service―good for something―to come in useful―serve one's purpose―prove of service―render service―stand one in stead発音を聞く 例文帳に追加 役に立つ - 斎藤和英大辞典
「to be useful」に関連した英語例文の一覧と使い方 - Weblio to be useful―of use―serviceable―of service―good for something―to come in useful―serve one's purpose―prove of service―render service―stand one in stead 例文帳に追加 役に立つ - 斎藤和英大辞典