Yes, a lemma is the simplest form or base form of a word.

是的，词元指的是某个单词的简或形式。

For example, with English, I would suggest if you learn the 800 most frequent lemmas-which is a word and its inflections-that will account for about 75 percent of all of the English language.

英语为例，我会建议如果你学习了800个常见的词元——这指的是一个单词及它的曲折变化——这样就占据了所有英语语言的75%。