as plain as the nose on your face 显而易见；一清二楚

【例句】
Surely you can see what's wrong; it's as plain as the nose on your face.
当然你能知道出了什么差错，这显而易见。

Good lord，it's as plain as the nose on your face; his girl friend has jilted him.
天哪，难道这还不清楚吗？他的女朋友把他甩了。