常見例句The ovule is unitegmic,tenuinucellate and anatropous.薄珠心，單珠被，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經(jīng)常敗育。 返回 amphitropous ovule