apical bud

例句：

1. 1.The plant's apex bud is the first sign of growth.
   植物的顶端芽是生长的第一个迹象。
2. 2. Insects use their apexes to climb up trees.
   昆虫使用它们的顶端芽来爬树。
3. 3.The apex of the mountain was covered in snow.
   山顶被雪覆盖。