single cutting tool

例句：

1. 1.The single tree in the garden is my favorite.
   花园里那棵唯一的树是我最喜欢的。
2. 2.He has a single friend in his life.
   他一生中只有一个朋友。
3. 3. There are only three seats left in the theater.
   剧院只剩下三个座位了。