People are subjects of practising activity.
人是实践活动的主体。
On the top of the envelope, jot down the date, subjects, or activity.
在信封封面，记下时间、主题或活动名称。
Secondary education system consists of subjects learning and activity courses.
中学课程体系由学科课程和活动课程组成。
Secondary education system consists of subjects learning and activity courses.
中学课程体系由学科课程和活动课程组成。
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