我明白课一个道理：永远不要让你的朋友失望的翻译：I understand that 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 that one principle: never let your friend down

I understand a class truth: Never must let you the friend be disappointed

I understand that a reasonable lesson: Never let your friends disappointed

I understand that one principle: never let your friend down