表面曝气桨的叶片数目为4-12片；

The surface aerating paddle has 4-12 blades.

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在人工轴流心脏泵的设计过程中，叶片数目的选取对泵的工作条件的影响很大。

During the design procedure for axial flow blood pump, proper blade number is important to whole flow performance in the pump.

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统计了不同发育时期的莲座叶叶片数目，发现突变体与野生型的莲座叶叶片数目没有差异。

We calculated the rosette leaf number at different developmental stages, and found that the number of rosette leaves of mutant did not differ significantly from wild type.

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