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This is the demo version, you can buy it and get more levels to play.
这是试玩版，你在购买后可以玩更多的关卡。
youdao
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You can download a Demo version from this site which is very useful.
你可以从这个网页下载试用版，它是很有用的。
youdao
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You can download a Demo version from this site which is very useful.
你可以从这个网页下载试用版，它是很有用的。
youdao