這個見仁見智,說來話長。知乎上有類似問題, 有很多去回答的,你自己看鏈接吧

https://www.zhihu.com/question/284647896/answer/698020448

https://www.zhihu.com/question/281660876/answer/696616019

https://www.zhihu.com/question/295174562

https://www.zhihu.com/question/282212976/answer/695178964

https://www.zhihu.com/question/323981872/answer/692968394

https://www.zhihu.com/question/282068476

https://www.zhihu.com/question/301216629/answer/665566664