/əˈsərtivnəs/
She taught the children assertiveness skills to help them stand up for themselves.
彼女は子供たちに自己主張のスキルを教えることで、自分自身を守るのを助けることを教えました。
He spoke with assertiveness while making his point during the debate.
彼はディベートで自分の主張を行う際に、自己を持って話しました。
His assertiveness was admired by his colleagues, who often sought his advice.
同僚は彼の自己主張力に感銘を受け、よく彼のアドバイスを求めた。