叶迹 leaf trace （又称“叶脉”）高等植物茎的节上长有叶片时，从茎分出进入叶片的维管束称为叶迹；在这种情况下，有形成叶隙的，也有不形成的，双子叶植物现在以三叶迹者居多。
通过实验研究提出了观察植物叶迹、叶隙立体结构的方法。
The article proposes the experimental method of observing the spatial structure of plants leaf trace and leaf crack.
茎的初生结构中多个维管束排列成环状，节部为单隙三迹，叶迹分别来自于3条维管束或同一条维管束。
The vascular bundles of the primary structure in stem are ring arranged, and the node is unilacunar and 3-traced, which is from three vascular bundles or one vascular bundle.
基于小型轴流压气机实验台，运用热线风速仪(HWA)，对不同转速、流量工况下，静叶排出口尾迹流动特性进行实验研究。
An experimental study of the stator blade wake in a small axial compressor is performed by using a hotwire anemometer (HWA) under different rotating speeds and mass flow conditions.
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