This is the remnants of all the locust trees, black locust trees.

这是一切刺槐剩下的，就是黑刺槐。

Well, let's look at what happened when humans helped another tree, the black locust tree, move north to a new environment.

恩，让我们看看人类帮助的另一种洋槐树，人们把洋槐树向北移，移到了一个全新的环境。

When they did this, the black locust tree spread so quickly that it killed off many plants and trees in the new environment, and some of these plants and trees were themselves already in danger of becoming extinct.

当杨槐被移到新的地方后，它们迅速的成长，扩散危急了那片土地原来生长的植物，而那些植物变得岌岌可危。