以下为句子列表：
英文: Roots also differ from roots in the arrangement of xylem and phloem, having a solid central strand of vascular tissue rather than a hollow cylinder of conducting tissue.
中文: 根和茎不同，它无叶绿素，没有芽和叶，木质部和韧皮部的排列顺序也不同，其内部为实心的维管组织，而茎的内部为中空的圆柱形输导组织。
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英文: Some problems from the principal stress axis rotation experiment with hollow cylinder apparatus are analyzed in detail herein; which consists of three aspects, such as the preparation of the hollow cylinder sample and the acquisition of the isotropic one;
中文: 摘要详细分析了采用空心圆柱仪进行主应力轴旋转试验遇到的若干问题，主要包括三个方面：空心圆柱试样制备及各向同性试样的获得；试验中尺寸效应、端部效应的考虑与消除；空心试样膜嵌入效应对排水、不排水试验结果的影响等。
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