因此，牧草栽培和谷物种植，在这里就成了必要条件。

Here, therefore, it was essential that land should be put under grass and corn cultivated.

youdao

因此，牧草栽培和谷物种植，在这里就成了必要条件。

Here, therefore, it was essential that land should be put under grass and corn cultivated.

youdao