jiě / jie / shì / yì / míng / gāo / zhōng / xué / shēng / píng / shí / xǐ / huan / cān / jiā / zhì / yuàn / huó / dòng

姐姐是一名高中学生，平时喜欢参加志愿活动。

My older sister is a senior high school student who enjoys volunteering.