汉译英（句子）：他们的友谊是建立在互相信任的基础之上的.
问题描述：
汉译英（句子）：他们的友谊是建立在互相信任的基础之上的.
一定要准确的答出关键词：建立在……基础之上.
请准确地回答,单词要拼写正确,
be based on和be built on都对啊？
答
their friedship is built/established on the basis of mutual truston the basis of mutual trust,they built/established their friendship.their friendship is based on mutual trust应该还有~