从心理学的角度说，人一般只能集中精力20分钟

来源: 阁主于 2013-06-05 12:01:10 [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.