Trying to grow new varieties of grain.

试图种植新的谷物品种。

Some farmers now think that it is not worthwhile to grow grain crops.

现在一些农民认为种粮食作物划不来。

Not quite literally, but without early man's discovery of using seeds to grow grain, we wouldn't have much of anything we have today.

也不完全是，但如果前人没有发现用种子可以种谷物，现在很多东西就不可能存在。

The economic income of its tobacco leaf is 75 times what grow grain.

其烟叶的经济收入是种植粮食的75倍.

The oyster dutifully coats the little marble with anouter layer of pearl and much time is saved not having to grow each pearl upfrom the size of a sand grain.

牡蛎会尽职尽忠地为自己腹中的小珠子包裹上一层又一层的珍珠质。 比起那些要从小沙粒开始慢慢成长的珍珠，人工的方法明显会节省很多时间。

Farmers here can grow only a few drought-resistant crops, and so when a food crisis happens they are forced to buy grain at very high prices.

那里的农民只能种植几种耐旱作物，因此，一旦发生粮食危机，他们就要被迫以非常高的价格购买粮食。

So farmers need to grow more grain to feed more animals, and that takes more fertilizer.

于是农民要种植更多的谷物来喂更多的家畜。于是肥料也用得更多。

It also takes a lot of resources to grow corn grain.

并且生产这种玉米需要耗费大量资源。