The premise of modifying a defective sentence is that we know what is wrong with this sentence? The composition of a sentence consists of various elements such as subject, predicate, object, adjective, complement, etc. We must first check whether the composition of the sentence is complete and whether there are any necessary elements such as subject, attributive, object, etc. are missing. If there are no problems with these, then check whether the modification is appropriate, determine whether the use is appropriate, whether there are any contradictions, etc. Analyzing your sentence, I found that the sentence structure is basically complete, but where is the problem? Is the mistake due to self-contradiction? Browsing means looking at something roughly, which is contradictory to looking at it carefully. So revise this sentence, either from careful to rough, or from browsing to reading.