我明白了一个道理：永远不要让呢的朋友失望。的翻译：I understand one principle: never let friends down. 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

I understand the truth: it's never let friends down.

I understand one principle: never let friends down.

I have understood a truth: Never must let the friend is disappointed.

正在翻译，请等待...

I understand one principle: never let friends down.