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。

youdao

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。

youdao

The second stage: suitable for children aged 5-7. Consolidating the previous knowledge, we add some letter combinations into class to develop their interest for spelling skills.

第二阶段：适合5 - 7岁的儿童。在巩固前一阶段学习的同时，加入一些字母组合读音的教学，让孩子对学习拼读单词有兴趣。

youdao

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