the plain的用法和樣例：
詞匯搭配
- as plain as the nose on one's face 顯而易見(jiàn)地
- as plain as the sun at noonday 清清楚楚
- as plain as the nose in your face 一清二楚
- plain as the nose on your face 顯而易見(jiàn)
- plain as the nose in your face 一目了然
- as plain as the nose on your face 非常清楚
