Of course, this does not mean that we Chinese can't learn gunpowder by inventing gunpowder, but a basic common sense is that a motivated nation, no matter what the learner does, will not give up his own way and go from one to another. Finally, of course, going abroad to learn Chinese is individual, but it can't be careless, because the popular Chongyang style has confused quite a few people, and they don't even know who they are. What's the central meaning of this passage? ['Learning to build rockets from foreigners is an endless act.', 'Going abroad to learn Chinese is the last one, and we must treat this kind of worship of the ocean with care.', 'China is an ambitious nation and will not learn from foreigners anything weaker than itself.', 'There are quite a few people who want to go abroad to learn Chinese, and must treat this kind of admiration for the ocean.']