China was among the first countries to sign the Comprehensive Nuclear Test Ban Treaty (CTBT).

中国是首批签署《全面禁止核试验条约》的国家之一。

youdao

China was among the first countries to sign the Comprehensive Nuclear Test Ban Treaty (CTBT).

中国是首批签署《全面禁止核试验条约》的国家之一。

youdao