The causes of migration can be seen

The causes of migration can be seen as a series of push and pull factors—those factors which either forcefully push someone into migration or attract them.

Results (Chinese) 1:

移徙的原因可以看作是一系列推拉因素 — — 这些因素有力地将有人推入迁移或吸引他们。

Results (Chinese) 2:

迁移的原因可以看作是一系列推拉因素，那些要么用力按压有人进迁移或吸引他们的因素。

Results (Chinese) 3:

迁移的原因可以看作是一系列的推动和拉动因素，这些因素可以有力地推动某人进入迁移或吸引他们。