So long as there is membership, special service is, and that service in a language learning app is, means one can achieve his or her goal either more efficiently or more effectively. To put it … From zhihu.com
At Duolingo, we're developing our courses to get you to a level called B2, at which you can get a job in the language you're studying. 官网的回答还提到： From zhihu.com
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