例句：
They feel lonely and sad.
他们感到孤独和悲伤。
If you feel lonely, you can talk with me.
如果你觉得孤单，你可以和我说话。
I told him that I worried about he would feel lonely again in the empty house.
我告诉他，我担心他在空荡荡的房子里又会感到孤独。
Sunshine, let it through my lonely heart.
沐浴阳光，任它穿透我寂寥的心房。
Lonely heart, to invade my world deserted.
寂寞侵向心底，我的世界一片荒芜。