When most of us get a text message on our cell phone from an unknown person, we usually say "sorry, wrong number!"

当我们收到陌生人的短信时, 我们通常会说：“对不起, 你发错了！”

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This is impossible when the component is reading data from a database because in this case, the number of items in the shopping cart is unknown before it's read.

当组件正在从数据库中读取数据时这是不可能的，因为在本例中，购物车中的条目数量在读取前是未知的。

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A couple of hours after I left the comment, I got a text message from an unknown number.

我评价过后几个小时，收到了一个陌生号码的信息。

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Ever get a text message from an unknown number that asked if you were interested in a certain service?

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That blast also appeared to stem from a car bomb and caused an unknown number of casualties, the group said, pointing to preliminary reports.

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