for a homogeneous rigid body, the radius of gyration is given only by its geometric shape, but not by its density.

two homogenous rigid bodies with identical shapes, but made of different materials (different densities), have the same radius of gyration.

对于几何形状相同而材料不同（密度不同）的均质刚体，其回转半径是相同的。

the role of ureterolithotomy in situ

原位法输尿管切开取石术

experience of 17 patients with ureteral calculi treated by laparoscopic ureterolithotomy

腹腔镜输尿管切开取石术17例体会

retroperitoneoscopic ureterolithotomy on patients with mid- upper segment of ureter stones

后腹腔镜下输尿管中上段切开取石术

retroperitoneal laparoscopic ureterolithotomy for the treatment of upper ureteral calculi(report of 15 cases)

后腹腔镜输尿管上段切开取石术（附15例报告）

retroperitoneal laparoscopic ureterolithotomy in treatment of ureteral calculi

后腹腔镜输尿管切开取石术的临床应用

comparison of the effect between retroperitoneal laparoscopic and lumbar straight incision ureterolithotomy

后腹腔镜与经腰背部直切口途径行输尿管切开取石术的疗效比较

retroperitoneal approach laparoscopic ureterolithotomy for upper ureter lithiasis

后腹腔镜输尿管上段切开取石术

abdominal versus retroperitoneal laparoscopic ureterolithotomy: a comparative study

经腹与经腹膜后腹腔镜输尿管切开取石术的比较

comparison of surgical outcome between retroperitoneal laparoscopic and lumbar straight incision ureterolithotomy

后腹腔镜与经腰背部途径治疗输尿管上段结石的疗效比较

to evaluate the selection of indications, surgical techniques of retroperitoneoscopic ureterolithotomy.

探讨后腹腔镜下输尿管切开取石术的适应症选择及手术技巧。

objective: to evaluate the clinical curative effect and practical value of laparoscopic transperitoneal ureterolithotomy.

目的探讨经腹腔行腹腔镜输尿管切开取石术的临床疗效及应用价值。

aim to sum up the experience of the upper and middle ureterolithotomy via the semilunar line incision.

目的总结经半月线切口在输尿管上中段取石术中应用的体会。

on the contradictions in news editing

新闻编辑矛盾论

the teaching model of news editing and production is the multi-skill;

新闻采编与制作专业的教学模式是一专多能；

the goal of news editing and production is professional mechanics;

新闻采编与制作专业的培养目标是新闻技工；

analysis of main problems in planning next generation news editing network

规划下一代新闻编辑网的主要问题分析

the developing background of news editing and production is media integration;

新闻采编与制作专业的发展背景是媒介融合；

the teaching characteristic of news editing and production is media products.

新闻采编与制作专业的教学特色是媒介产品。

the essay gave priority to the editing ideology's embodiment in the network news execution in the revolution of news editing notion.

本文从商业网站新闻专题的编辑特点入手，重点考察了在网络新闻编辑观念的演进中，编辑思想在网络新闻专题制作中的体现。