英语语法分析

When corn came to Europe from Mexico, now they had a much hardier crop that could be grown easily in more northerly climates and the centers of power began to shift accordingly.

当玉米从墨西哥传到欧洲的时候，他们有了一种更耐寒的作物，更容易在更偏北的气候条件下种植，权力的中心也随之转移。

The fish, Chen notes, are hardier and don't require as much work.

陈海平说，这种鱼生存能力更强，而且不需要费多大劲儿照顾。

It is much hardier than lemon, however, though less hardy than grapefruit and sour orange.

它虽不及葡萄柚和酸橙耐寒，但却比柠檬耐寒得多。