我明白了一个道理：永远不要让你的朋友失望的翻译：I understand one principle: never let your friend 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: never let your friends down

I understand one principle: never let your friend down

I have understood a truth: Never must let you the friend be disappointed

I can understand the logic behind it: Never let your friends disappointed

I understand one principle: never let your friend down