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本人初学者，请问有人遇到过这这种情况吗，跟着文章敲了一遍之后出现了这样的问题，查询话题列表的时候发现odom这个并不会马上出现，还有cmd_vel有时候也会消失
当出现这样的日志之后 才会有odom的话题，这个情况是正常的吗？
