众所周知，钻石是最坚硬的物质的翻译：As we all know that diamonds are the hardest substance 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

As we all know, diamonds are the hardest substance

As we all know that diamonds are the hardest substance

It is well known, the diamond is the hardest material

It is well known that diamond is the hardest material

As we all know that diamonds are the hardest substance