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- Varieties that do not produce fertile pollen are used as females. 不产生可育花粉的品种被用作母体。
- The intine (I) of aperture in fertile pollen grains was opened with conspicuous three strata.Sterile pollen grains display a thickness intine and exine in the aperture which was not opened. 雄花花粉于孔区之花粉外壁破裂且花粉内壁具明显三层,但两性花所产生的不孕性花粉之孔区的内壁较厚且外壁通常不破裂。
- There is a high pollen count in the air. 空气中有很高的花粉计数。
- There are fertile fields in the Nile Delta. 尼罗河三角洲土地肥沃。
- The plains of Alberta are extremely fertile. 艾伯塔平原极其肥沃。
- Most chicken eggs are not fertile. 多数鸡蛋未受精。
- The fields hereabout are fertile. 这一带的土地很肥沃。
- Stamen is in the middle of a flower and may produce pollen. 雄蕊长在花的中央,能产生花粉。
- The country is barren, with here and there a fertile spot. 土地荒芜,只是偶尔有一两片沃土。
- Not fertile; unproductive or barren. 不肥沃的不肥沃的; 不生产的或贫瘠的
- A microscopic fossil, as of a pollen grain or unicellular organism. 微体化石一种微小的化石,如花粉粒或单细胞有机体的化石
- The workers have little pollen baskets on their legs. 工蜂脚上有装花粉的小"篮子"。
- Anther is a part of a flower that contains the pollen. 花药是花的雄蕊上带花粉的部分。
- The rotation of crops keeps the soil healthy and fertile. 谷物轮种使土壤保持了肥力和高质。
- fertile pollen 能育花粉
- The innermost wall of a spore or pollen grain. 内壁孢子或花粉粒最深处的壁
- The barren land has been turned into fertile fields. 贫瘠的土地已改成良田。
- They drained the swamp and turned it into fertile land. 他们排去沼泽地的水,将它变成了肥沃的土地。
- Pollen sterile blossoms lack normal turgor. 花粉不育的花朵缺乏正常的膨压现象。
- The land is so fertile that three crops a year can grow. 这片土地很肥沃,一年可种三季庄稼。