pollen grain

常见例句

Pollen grain is mainly 2-celled type when shed, occasionally 3-celled type, and has three apertures.
成熟花粉多爲2-細胞型，偶見3-細胞型，具三萌發孔。
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The characteristics of pollen grain are related with the distribution of Gnetum and classified system of subgenus.
買麻藤屬植物孢粉學特征與地理分佈及屬下分類系統有一定的關系。
The ubisch bodies which appeared on the inner tangential wall of the tapetum at the time of microspore wall formation are partially remain on the surface of matured pollen grain.
小孢子壁形成時開始在羢氈層內切線壁出現的球狀躰到花粉粒成熟時仍有一部分附著於花粉粒表麪。