look as if butter would not melt in one's mouth

例句：

1. 1. I looked at the clock and realized it was time to leave.
   我看了看表，意识到该走了。
2. 2. She looked around the room and saw a painting on the wall.
   她环顾四周，看到墙上有一幅画。
3. 3. Look closely at the details of this painting;they are quite remarkable.
   仔细看看这幅画的细节；它们非常了不起。