The walkingbus idea originated in the United Kingdom, and the expression has been in general use there since 2004.
“步行巴士”这一理念来自于英国,而walking bus这个表达自2004年起就开始广泛使用了。
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Quotation: For children too young to walk on their own, parents can walk with them. Better still, organise a walkingbus and pick up other children along the way.