The content can be polished a little bit. for example, for the second example, we may say:
Another purpose for producing current is to create a electric field in order to detect object nearby and navigate, which helps a lot for those fish with poor visual ability and those in the muddy water. For example, Knifefish can generate electric filed and sense the disturbance from rock nearby, and thus avoiding from crashing or hurting from the rock.
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The content can be polished a little bit. for example, for the second example, we may say:
Another purpose for producing current is to create a electric field in order to detect object nearby and navigate, which helps a lot for those fish with poor visual ability and those in the muddy water. For example, Knifefish can generate electric filed and sense the disturbance from rock nearby, and thus avoiding from crashing or hurting from the rock.