A language exchange app or website could be very useful to those who, like your friends, have studied English at university but do not yet feel they have mastered it. These apps and websites allow people to advance in language learning by chatting with native speakers. Examples include the apps Tandem, and also HelloTalk, and websites like MyLanguageExchange, or perhaps Polyglot Club, or maybe HiNative. Of course, a social network, such as Steemit.com, can also provide connections with native speakers.

Anyone who wishes to translate this comment into good Chinese is welcome to do so. Here I append the automated product of Google Translate, which is likely to contain errors.

一个语言交换应用程序或网站可能对那些像你的朋友一样在大学学过英语但还不觉得自己掌握了它的人非常有用。 这些应用程序和网站允许人们通过与母语人士聊天来进步语言学习。 例子包括Tandem应用程序，HelloTalk应用程序，以及MyLanguageExchange或Polyglot Club或HiNative等网站。 当然，一个社交网络，如Steemit.com，也可以提供与母语人士的联系。

任何希望将此评论翻译成中文的人都可以这样做。 在这里，我添加了Google翻译的自动化产品，它可能包含错误。