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can't use sudo rosbag

I can use rosbag by "rosbag record" and "sudo su" then "rosbag record" ,but I can't “sudo rosbag” I will get that:: ""Traceback (most recent call last): File "/opt/ros/melodic/bin/rosbag", line 34, in <module> import rosbag ImportError: No module named rosbag"" How should I config env?