名词
中文翻译：活动
同义词：
['vigor', 'zest', 'vitality']
例句：
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1.The activity of the students in the classroom is high.
学生们在课堂上的活动非常活跃。
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2.The new project has a lot of activity going on.
新项目有很多活动在进行。
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3.The team's activity level has increased significantly since they started working together.
自从他们开始一起工作，团队的活动水平显著提高。