至1957年，全国气象台站已达1647个，初步组成了全国基础气象台站网。
Untill 1957, the number of weather stations in the whole country reached to 1647 and the national basic weather net was formed.
至1957年，全国气象台站已达1647个，初步组成了全国基础气象台站网。
Untill 1957, the number of weather stations in the whole country reached to 1647 and the national basic weather net was formed.
应用推荐