在茎的次生结构中皮层与韧皮部之间有一层扁平形细胞；
There is a layer of compressed cells in the secondary structure of stem.
体壁皮细胞缩小呈扁平形，无细胞核，连成线状，有断裂；
The epidermal cells in the integument became flattened, smaller in size, and without nuclei.
对扁平形聚酯纤维和圆形聚酯纤维的结构和性能进行了研究。
The structure and properties of flat section and circular polyester filament were studied through measuring birefringence, sonic modulus and work coefficient ect.
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