remap用于topic的映射：
下面是两个launch启动两个节点的例子： 一个节点叫talker，它发布一个topic名为/talker 一个节点叫test1，它订阅一个topic名为/talker_mid
<launch>
<node pkg="test" type="talker" name="talker" output="screen">
<remap from="/talker" to="/re_talker" />
</node>
</launch>
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<launch>
<node pkg="test" type="test1" name="test1" output="screen">
<remap from="/talker_mid" to="/re_talker" />
</node>
</launch>
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