duolingo ,现又在试用speak, 看样子两个可以互补。

来源: 山里人家168 于 2025-08-18 22:26:55 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.