You can take a substance that works in your system, but then you take this over here that's not banned, and this over here that's not banned, but if you mix them together, you've got a banned substance in your system.
你可以取一种在你的系统中起作用的物质，然后你取这里这个没有被禁止，这里这个也没有被禁止，但是如果你把它们混合在一起，你的系统中就有了一种被禁止的物质。
标签
Banned
Substance