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原因·：对于mesh文件（dae、stl），gazebo那边识别不了 package://claw_description 这种ros系统的路径查找方式（尝试运行的话，gazebo直接卡在那里），只能用 $(find claw_description)这种方式找到绝对路径并替换。
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@wty-yy 感谢！~
