其中一组数据是卫星测量的记录，数据可追溯到20世纪50年代，而另外一组则是跨越整个20世纪的船上目测数据。

One, from satellite recordings, stretched back to the 1950s, while visual observations from ships span the whole of the 20th century.

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如果以前没有学习过活动记录——Rails底层的持久性层，我建议您先阅读跨越边界系列中以前的这篇Rails文章。

If you've not seen Active Record — the underlying persistence layer in Rails — before, I recommend that you take a look first at this earlier Rails article in the Crossing borders series.

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凯特写的短信和邮件一般都尽可能简短，“所有可能引起误解或者被指责跨越了师生关系界限的内容都缩减掉了。” 她手写的记录和邮件有很大的不同，比如叫一个学生课后到218室讨论他的作业问题，她的邮件或短信会写成：“CU 3.45，我的办公室。”

Email and texts, Keates notes, are routinely abbreviated, "which can lead to misinterpretation, and accusations that the boundaries of a professional relationship are being crossed."

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