n. (c./u.)名詞 (可數/不可數)活動What is your favorite weekend activity in London?
n. (c./u.)名詞 (可數/不可數)業務The company's main activity is manufacturing car parts.
n. (c./u.)名詞 (可數/不可數)活動 (電腦)The system logs all user activity.
n. (c./u.)名詞 (可數/不可數)活動 (金融)Increased trading activity led to higher profits.
n. (c./u.)名詞 (可數/不可數)放射性The activity of the sample was measured in becquerels.
n. (c./u.)名詞 (可數/不可數)化學活性The chemical activity increased after adding the catalyst.