妹は活発な子で、休み時間はいつも外で遊んでいる。
My younger sister is a lively child who always plays outside during recess.
会議では活発に意見が交わされた。
Opinions were exchanged actively at the meeting.
この火山は近年、活動が活発になっている。
This volcano has become more active in recent years.
年末は株式市場の取引が活発だ。
Trading on the stock market is brisk at the end of the year.