This is a common problem with electronic editions produced using OCR technologies and it is particularly frustrating because it is impossible to search and retrieve words that aren't spelt properly.
这就是使用光盘技术的版本，都会出现的共同错误，而且，这很令人沮丧，因为无法，搜索检索那些拼错的词。
One way to get around this problem is to keep a few new words in your vocabulary by using them on a daily basis.
一种解决这类问题的方法是通过每天使用新词汇来记忆它们。
However, the ideas and vocabulary are more important than the linking words, so using "firstly, secondly, finally" twice isn't a big problem.
但是，ideas和词汇远比连结词重要，所以，使用两次“firstly， secondly， finally”结构并不是一个太大的问题。
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