single split mold

例句：

1. 1.The single tree in the park is a symbol of hope.
   公园里那棵孤立的树是希望的象征。
2. 2. She has only one friend in the whole world.
   她全世界只有一个朋友。
3. 3.He was single for many years before he met his wife.
   他在遇见妻子之前单身了多年。