We will give away a free 3 slice configuration for a year at random.
我们将随机挑选慈善会议的一名参会者，为其提供一年免费的3刀片配置的服务器主机服务。
Out of 255 IBM product announcements chosen at random, only five were completely error-free.
在 255 个 IBM 产品公告中，只有 5 个完全没有错误。
The researchers also selected at random a control group of 478 children who weren't given reading books. Those children were offered free activity and puzzle books.
研究者还随机选择了478个孩子作为对照组，没有给他们阅读书籍，而是给他们免费的活动和猜谜书籍（不清楚是些什么书）。
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