For each character in the first string, any letter that appears in the second string is replaced by the corresponding letter from the third-string.

对于第一个字符串中的每个字符，第二个字符串中的任意一个字符都由第三个字符串中相应的字母所替代。

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Every time you see the letter "a" followed by the letter "X," you have to press the space bar.

每当你看到字母X紧随在字母a后面，你就按下键盘的空格键。

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The Canadian postal code format, shown in Listing 9, is letter, number, letter, followed by a space, then number, letter, number

加拿大的邮政编码格式是字母、数字、字母、一个空格、数字、字母、数字，如清单 9 所示

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But members of the Digital Due Process Coalition say sending an e-mail should be no different from mailing a letter that is protected by law from being opened.

VOA: standard.2010.06.22

Also,we see the letter of Ephesians--again,claims to be by Paul but I'll argue is not by Paul when we get to that lecture, way into the semester.

再看看以弗所书，它也自诩为保罗所写,但我认为不是，到那节课我们再讲，这要到学期开始比较久之后。

耶鲁公开课 - 新约课程节选

Every word is painstaking created letter-by-letter, as he stares intently at the screen, his arms at rest, his right hand displaying a 2009 Saints Super Bowl ring.

FORBES: Meet the Real Hero of Today's Super Bowl, Steve Gleason

This result can provide a stunningly detailed view of the genome, but this letter-by-letter approach may also sometimes result in scientists missing the forest for the trees.

FORBES: Magazine Article

Lucy expected to be able to spend the rest of her days here but two weeks ago she - along with her fellow residents - was handed a letter by the owners - the Royal Bank of Scotland Care Homes Foundation - giving her three months notice.

BBC: RBS shuts care homes to save money in Canterbury