同根派生 amphitropous ovule相关词英汉例句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。amphitropous ovule更多例句