Our foreign trade policy has always been based on equality and mutual benefit and exchange of needed goods.
我们的对外贸易政策一向是以平等互利、互通有无为基础的。
He informed the station at once, but no one there was able to explain the mystery.
他马上把情况报告了该基地,但那里的人没有一个能解释这到底是怎么回事。