这些花朵在花间作物中并不寻常，因为它们还是第一次在北美为人们所种植。
The flowers are unusual among crops because they were first domesticated in North America.
尽管那块田地是属于祖父的邻居，但在那个时候，邻居之间作实物交易是很常见的，所以祖父也能在那块田地种上自己喜爱的农作物。
This was not his land but back in those days it was not unusual to barter with the neighbours to worked it for them so he could grow the vegetables that he loved.
间作在常规农作物生长间期内种植的农作物，比如冬麦或三叶草，以预防土壤侵蚀并能提供腐殖质和氮。
Cover crop: a crop such as winter rye or clover planted between periods of regular crop production to prevent soil erosion and provide humus or nitrogen.
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