四倍体刺槐自身花粉粒的形状结构之间表现出丰富的变异：体积与形状多样，萌发孔沟的数量及位置不固定，外壁表面的纹饰特征彼此不同等等；
There were remarkable variations in the shape, volume, location and number of bourgeon -hole channels and veins on surface of pollen among pollens of TRP.
整体铸角延伸至侧板提供额外强度支撑，同时侧门孔和较宽的圆柱槽沟确保安装和拆卸的简便。
Integrated corner casting with extended side plate lamination provides extra support whilst the side access holes and wide cylinder slot ensures easy fitting and removal.
道路平整、畅通无阻；孔、洞、沟等盖板齐全。
The way is smooth and cover plates of holes and trenches are ready.
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