将欣赏理解尊重变为名词形式,用between the two代替使用动词时的to each other,就可以使用it is的形式了
另外用西方的思维,是……的基础用support会更贴切
如下：
It is the appreciation,comprehension and respect between the two that support love.
若要避免头重较轻,可以说：
What being the prerequisite of love are the appreciation,comprehension and respect between the two.