要有＜值得喜悦的事情＞，脸才会做出笑与平和的表情；
要有＜充满希望的事情＞，脸才会做出充满希望的表情。
You have to have <things to be happy about> in order for you to have a smiling and peaceful face.
You have to have <things to feel hopeful about> in order for you to have a hopeful face.
＜内心＞要笑、要平和，＜脸＞才会表现出笑与平和的模样。
Your <heart> has to smile and feel peaceful in order for your <face> to have a smiling and peaceful expression.
