交通法规规定，12岁以下儿童不能在道路上骑自行车。

According to the traffic law, children under 12 mustn't ride bicycles on the road．

youdao

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。

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."

youdao

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。

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."

youdao

据日用品安全委员会统计，每年大约有25 000名14岁以下儿童在使用跑步机、健身自行车和健身踏板时受伤。

000 children under the age of 14 are injured on treadmills, stationary bikes and stair climbers every year according to the Consumer Product Safety Commission.

youdao

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。

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."

youdao

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。

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."

youdao