《美国国家健康访问调查》的结果显示，在2008年下半年，超过20%的美国家庭只使用无线业务。

In the second half of 2008, more than 20% of U.S. households had only wireless service, according to a National Health Interview Survey.

youdao

《美国国家健康访问调查》的结果显示，在2008年下半年，超过20%的美国家庭只使用无线业务。

In the second half of 2008, more than 20% of U.S. households had only wireless service, according to a National Health Interview Survey.

youdao