The bulk of the Metaphone algorithm is a set of rules that map letter combinations into the consonant classes.

Metaphone算法整体上是一套规则集，可以把字母组合映射成辅音类。

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Children at this age can hear the sound of letter combinations better now and can hear the phonic differences.

这个年龄的孩子已经可以更好地听清字词组合，也可以听清字词的不同处。

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In the research Bell highlights examples of words that have the same pronunciation but different letter combinations.

在贝尔的研究中，她特别举出了一些不同字母组合相同发音的单词的例子。

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It uses algorithms to recognise that some letter combinations are more likely to form words than others.

BBC: The software is based on pattern recognition