因此，我们用这四种物质的混合物作为外标的翻译：Therefore, we use a mixture of these four substances as an external standard 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

Therefore, we used a mixture of these four substances as external standard

Therefore, we use a mixture of these four substances as an external standard

Therefore, we use these four material the mixture to take the external standard

Therefore, we have used this 4 a mixture as a standard

Therefore, we use a mixture of these four substances as an external standard