因此，往往随着优等品系的生产，家养动物、谷物、西红柿等被喂养或栽培下来。

They have thus been bred or cultivated, often with a production of superior strains, as with our domesticated animals, our food grains, and our potatoes.

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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.

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在欧亚广泛栽培以收获其谷物，在北美洲种植以获取桔杆的一年生植物（稷稷属）

An annual grass (Panicum milaiceum) cultivated in Eurasia for its grains and in North America for hay.

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