[植]花粉粒

pollen grains───花粉粒（pollengrain的复数）

bullet train───动车

mole drain───地下排水沟，鼠道式排水沟

power train───传动系；动力传动系；动力传动机构

to engrain───to engrain

Pullman train───Pullman train

swollen organ───swollen organ

pollen analysis───花粉分析

polling station───（英）投票站

mature pollen grain is 2-celled.───成熟花粉为2 -细胞型。

The pumpkin pollen grain in the middle is0.2mm and just about visible to the naked eye───中间的南瓜花粉有0.2毫米，肉眼刚刚能看见。

We can see spinous pollen grain in the fruit by microscope.───显微观察可见,果中的刺球状花粉粒最为显著.

mature pollen grain accompary with proteins.───成熟花粉粒中多糖和蛋白质并存。

It had snow - melting - like veins on the surface of pollen grain with several hollows.───萌发孔沟多为3对(顶分体3条,侧分体各对应1条),以四面体几何中轴为中心,中心对称分布于四面体的3个侧面.

We can see spinous pollen grain in the fruit by microscope.

Pollen grain germination and tube growth were investigated in intergeneric crosses between Brassica species and O.

In seed plants it is the generative cell in the pollen grain, which divides in the pollen tube to produce two sperm cells.

In many gymnosperms the nuclei divide within the pollen grain to produce a small number of cells (2-40 depending on the group )representing the male prothallus .

After uninuclear pollen grain forms, the growing speed of the pollen grain of oblong anthers and of globose anthers roughlg corresponds to each other.

Title Pollen grain morphology in the Ericaceae.

The characteristics of pollen grain are related with the distribution of Gnetum and classified system of subgenus.

The probability of any air-borne pollen grain impacting a female strobilus is in any case very small.

The mature pollen grain belongs to two cells: 1 vegetative cell and 1 germ cell.