如果是有重复的数据集，该算法就会自动转到随机模式。
If the dataset has duplicates, this algorithm automatically falls back to random mode.
自动语音会提示用户重复跟读2个随机产生的4位数，如果用户通过测试，语音系统便会自动列出已购买商品的清单，并要求客户确认。
An automated voice will then ask him to repeat two randomly generated four-digit Numbers. If he passes this test, the voice will list the items being bought and ask for confirmation.
播放目录。允许你伫列几个档案，依序播放。支援自动重复和随机播放。
Playlist. Allows you to enqueue several files to be played one after each other. Autorepeat and shuffle supported too.
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