权威例句
Walk to schoolPhysical Activity Levels of Children Who Walk, Cycle, or Are Driven to SchoolThe Long Walk to School: International Education Goals in Historical PerspectiveMapping the Walk to School Using Accelerometry Combined with a Global Positioning SystemFactors associated with children being driven to school: implications for walk to school programsThe Long Walk to School: International Education Goals in Historical Perspectives Working Paper No 37 (March)Mapping the walk to school using accelerometry combined with GPSActivity levels, dietary energy intake, and body composition in children who walk to schoolEstimating the proportion of children who can walk to schoolChanges in the percentage of students who walk or bike to school-United States, 1969 and 2001