I did come across a document (PDF) from the U. s. Consumer Product Safety Commission that suggests that ages four and five are when it's appropriate for kids to "ride small bicycles."

我怡好从美国消费品安全委员会里看到一份文件(PDF格式的)，上面告诉我们，四岁五岁是孩子“骑儿童自行车”的适当年龄。

youdao

The service consumer creates an inventory request document according to the STAR schema.

服务消费者根据 STAR 模式创建目录请求文档。

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Delivering documents electronically gets them into consumer and customer hands quicker, saves money, conserves paper, and simplifies document updates.

发布电子文档能让客户更快地获得这些文档并可以省钱、省纸和简化文档更新。

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"The industry is evolving very rapidly, and the law today is a 20th-century interpretation of an 18th-century document that is holding back the entire retail industry as it adapts to 21st-century consumer preferences and demand, " said David French, senior vice president for government affairs at the National Retail Federation, a retail-industry trade group lobbying for the legislation.

WSJ: Tax-Free Web Shopping Nears End