The platform is based on a communications satellite that China has been building for years.

中国近年来一直在建造的通讯卫星所基于的平台(才是)。

youdao

The platform is based on a communications satellite that China has been building for years.

中国近年来一直在建造的通讯卫星所基于的平台(才是)。

youdao