表面曝气桨的叶片数目为4-12片；
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.
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.
目前离心式压缩机叶片数目的确定主要根据经验公式，同一叶轮取不同数目的叶片对叶轮内部流场的影响缺乏定量的分析。
Currently, determination of compressor blade number is mostly base on experimental formula. The effect of Impeller with different blade number on flow field lacks of quantitative analysis.
讨论了改变叶片数目，增加叶片厚度，调整分流叶片周向位置以及增加间隙高度等对离心叶轮流量、压比和效率等总体性能的影响。
The influence of blade number, blade thickness, location of splitter blades and tip clearance on mass flow, pressure ratio and efficiency is showed.
植物叶片表皮存在的数目众多的小孔，打开时允许气体自由出入进行交换。
Stoma (pl. stomata) One of a large number of pores in the epidermis of plants through which gaseous exchange occurs.
再生植株叶片气孔大小和气孔保卫细胞内叶绿体数目可以作为从再生植株中早期鉴别四倍体植株的可靠指标。
The stoma size and chloroplast number in guard cells could be regarded as the reliable indicators of ploidy levels to identify seedlings in the early stage.
其它光质下单位叶面积细胞数目依次为黄、红、白和绿光下的叶片。
Generally speaking, the leaves grown in yellow light had more number of mesophyll cells than those grown in red, white, and green light.
不同放牧制度下，同一植物种群的枝条（叶片）重量差异极显著，且与枝条（叶片）数目之间回归关系显著。
The single tiller weight of the same plant was significantly different among grazing systems, besides, there was a significantly correlation with the number of tillers.
不同放牧制度下，同一植物种群的枝条（叶片）重量差异极显著，且与枝条（叶片）数目之间回归关系显著。
The single tiller weight of the same plant was significantly different among grazing systems, besides, there was a significantly correlation with the number of tillers.
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