Externally pale brownish-yellow or pale brown, with irregular, longitudinal wrinkles, cork easily exfoliated, exposing yellowish-white cortex, sometimes showing reticulated fibre bundles.
表面为浅棕黄色或浅棕色，有不规则纵皱纹和众多横长皮孔样突起，栓皮易剥落而露出黄白色皮部，有时可见网状纤维束。
Furthermore, it is revealed that the fracture of fibre results from the longitudinal sliding displacement of fibrils or microfibrils.
还发现聚乙烯纤维在单向拉伸下的断裂是通过细纤维或细纤维束的相互滑移而实现的。
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