不需要多加思考就肯定地做出判断
示例
A：William looks pale when getting out of the office.
B：As plain as the nose on your face, he was blamed for the neglect of responsibility.
A：威廉从办公室里出来，脸色苍白。
B：显而易见，他因为怠忽职守被批了。
A：Linda is really promoted, how do you know?
B：It is as plain as the nose on your face. She works very hard.
A：琳达真的升职了，你怎么知道的啊？
B：这是很明显的嘛，她工作那么努力。