单词：amphitropous ovule
amphitropous ovule的用法和样例：
例句
- The ovule is unitegmic,tenuinucellate and anatropous.薄珠心，单珠被，倒生胚珠，蓼型胚囊。
- Frequently the basal ovule, which is the last one to be fertilized would abort.最后受精的基生胚珠经常败育。
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