Tutor a classmate who's having trouble, help clean up your neighborhood, participate in a walkathon for a good cause, or volunteer your time in some other way.
辅导有困难的同学，帮邻居打扫房屋，参加为特定事业筹款而进行的步行马拉松，或者其他志愿活动。
After the walkathon, his soles were sore.
长途步行后，他的脚底都痛了。
After the walkathon, his soles were sore.
长途步行后，他的脚底都痛了。
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