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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在本世纪上半叶，科学家仍然认为，细胞是一个相当简单的原生质斑块。

In the first half of this century, scientists still assumed that the cell was a fairly simple blob of protoplasm.

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在视野中心是一个嗜碱性细胞，它有一个多叶核(象pmn的核)，并且细胞质里有为数众多的粗糙的、深蓝色的颗粒。

There is a basophil in the center of the field which has a lobed nucleus (like PMN's) and numerous coarse, dark blue granules in the cytoplasm.

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