我跟他公示的时候有时候会奇怪他为何要改变，但这确实好用，你就会想‘他是个天才’。
While I worked with him I would sometimes wonder why he was making a change, but it would work and you'd think 'the man's a genius'.
不幸的是，要想知道一款记忆软件是否确实好用，你至少需要花一个月的时间去使用它(要想获得更好的结果，那就最好花一年)。
Unfortunately, to know if spaced repetition software really works you have to use it for at least a few months (and for the best results, years).
在使用PorterStemmer时我发现nltk. tokenizer . wstokenizer类确实如教程所警告的那样不好用。
I made the discovery, while playing with the PorterStemmer, that the class nltk.tokenizer.WSTokenizer really is as bad as NLTK's tutorial warns.
但据朋友说，这个功能确实很好用。
But according to my friend that this feature is indeed useful.
我使用它们的次数并不多，但是它确实非常好用。
I don't use these too much but have found them really useful from time to time.
我使用它们的次数并不多，但是它确实非常好用。
I don't use these too much but have found them really useful from time to time.
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