top member of graft

例句：

1. 1. The scientist grafted a new species onto the old one.
   科学家将一个新物种嫁接到老物种上。
2. 2. The carpenter grafted a new branch onto the tree.
   木匠在树上嫁接了一个新的树枝。
3. 3. The farmer grafted a new root system onto the old one.
   农民在旧根系统上嫁接了一个新的根系统。