In my opinion, I disagree with the ideas expressed above
Don't start your essay like that. Restate the question in your essay. However, before restating your question you have to write a hook. A hook is nothing but some general statement of your essay. I mean write something in general about the topic. By the way, hook should not be more than 2 sentences; otherwise your intro will be too long. in brief your intro should contain a hook then restatement of the question then your opinion; total 4 sentences. This way you can develop a nice short intro. :)
First of all, it is only in universities could young people learn professional knowledge, which is the cornerstone of their successful career.
This sentence is not right. i don't know what are you trying to say. most probably you tried to say: "first of all, university is the only place where young people can learn professional knowledge and this knowledge will help them to pursue a successful career." still not sure whether i get that right. :P. anyway you should write it clearly and properly.
For example, if a student wants to be an excellent lawyer,
Don't use hypothetical example in this way. Try to put a specific example. Write you know a lawyer who is excellent in his job, and then write what he did to be an excellent lawyer. This is actually a hypothetical example, however, you are saying you actually know the man but in reality you don't; you are just making that up.
By doing this your writing will be more focused and coherent. Moreover your word count will increase... hope i have made myself clear.
wish you all the best