他经常骑自行车上学，有时他步行上学。
He often goes to school by bike, but sometimes he goes to school on foot.
有时他步行上学。
他六岁时在密西西比州的克拉克·斯代尔市读书，每天他步行上学都会路过一位中年女士布茜小姐的房屋前。
From the age of six he had walked to school in Clarksdale, Mississippi, past the house of a middle-aged lady called Miss Boozie.
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