12XG

如果说灰是介于白和黑的，那么有没有什么东西是介于黑白灰之间的呢，就像三角形三个顶点连线，里面肯定有东西的吧。
If grey is between white and black, then there is anything between black, white and grey, just like the three vertices of a triangle, there must be something in it.