A cryptographic system in which units of plain text of regular length, usually letters, are arbitrarily transposed or substituted according to a predetermined code.

密码：一种密码系统，其中固定长度的明文里的单元，通常为字母，被任意倒置或按事先确定的符号系统替换。

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When translating regular prose, the length of the translation is seldom important.

翻译普通的散文时译文的长度一般不重要。

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Maintaining a white finish over a length of time would present its own problems as a paint finish on such an exposed part of the house could require regular maintenance with difficult access.

况且，要它长时间的保持白色外观本身就会产生一些问题，因为在这块房屋外露的部分进行油漆粉刷是很难进行定期的维护保养的。

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Sports, because of the scarcity of games, each individual game means more than it would in a season of regular length, potentially making the experience more exciting for the hockey fan.

FORBES: Nearing Playoffs, NHL Buzz Almost Back at Pre-Lockout Levels

You will benefit more from doing regular gentle exercise for a good length of time, than exercising very vigorously for a short length of time or infrequently, they say.

BBC: Can too much exercise cause a stroke?

In his Paris Review interview, Tom Wolfe refers to Zola at length, saying that regular deadlines can be good for fiction writers, because it forces them to create semi-believable plots and characters without being excessively fussy.

WSJ: Neal Pollack on Writing a Detective Serial | Word Craft