翻译啦~~

当你爱着一个爱你的人,那是一件多么幸福的事。
How happy a thing when you love the person that loves you!

what a happy thing when you were loved by the person you loved!

What a great joy when the one you love loves you!

when you love someone, that's a blessed affair

Things canbe happier if you love who loves you

It's a wonderful thing to be in love with someone who loves you.