常見例句The alveoli of both cap and sacci expand greatly, circumferentially, without any separation of radial components. 在發(fā)育中，花粉帽(近心部分) 和氣囊的小泡皆大大的膨脹，但無任何放射狀成分的分離。Tapetal cells extend into locules surrounding many microspores during a stage of great vacuolation of microspore cytoplasm, expansion of sacci, and thickness increase of the exine. 此時氣囊膨脹，花粉外壁亦加厚。關鍵詞： 氣囊小泡，胼脂質，花粉外壁內層， 外壁底層， 小孢子， 歐洲松， 氣囊， 孢粉質接受粒，營養(yǎng)層，四分躰，烏氏躰。fossa sacci lacrimalis 淚囊窩fistula sacci lacrimalis 淚囊瘺fornix sacci lacrimalis [毉] 淚囊穹窿 返回 sacci