But if CAPTCHAs are broken it might not be a bad thing, because it would signal a breakthrough in machine vision that would, for example, make automated book-scanners far more accurate.

而验证码系统被破解倒也未尝不是一件好事，因为这标志着机器视觉取得突破，或许，自动书刊扫描系统将由此变得远比现在精准。

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Indeed, if you can get a wifi signal, you can buy a book.

的确，只要能有无限网络，就能买到书。

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A new book on the Titanic has suggested that the doomed liner did not send out a distress signal for three quarters of an hour after it hit the iceberg which ruptured its hull.

一本关于泰坦尼克号的新书说这艘毁灭的班轮在撞上毁坏船体沉没前的45分钟内冰山没有发出求救信号。

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After the publication of the book, a drama scholar wrote to Mr. Unsworth asking for his source on the hand-signal system.

WSJ: A Tribute to Barry Unsworth | Dear Book Lover