Here, therefore, it was essential that land should be put under grass and corn cultivated.
因此，牧草栽培和谷物种植，在这里就成了必要条件。
We must take good care of it. That is to say we should try our best to keep the land, water and air clean.
我们必须照顾好它，换而言之，我们得尽力保持陆地、海洋和空气的清洁。
We must take good care of it. That is to say we should try our best to keep the land, water and air clean.
我们必须照顾好它，换而言之，我们得尽力保持陆地、海洋和空气的清洁。
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