没想到大家水平这么参差不齐，好吧，放个更浅显视频，科普一下

来源: replicator 于 2016-05-17 15:18:35 [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.