The book has a total of 30 units, each unit has 8 roots, four words under each root, plus the last 8 words of each unit from mythology and history, a total of 40 words. The example sentences are accurate, especially the explanatory paragraph of each word, which is very readable. It is worth mentioning that each word will be accompanied by a short background explanation, telling you the ins and outs of the word, like an independent story, and some will have a synonym. It is relatively easy to know a word, but it is relatively difficult to master the word interpretation and to achieve random rewriting. The advantage of mastering the roots is that it can help us "real" to know a word, the memory is extremely profound, and if you have a root in the new words, you can often guess more than half. Although the root affixes ultimately play an auxiliary role, only the vocabulary is accumulated to a certain extent, and when you learn further, you will not be able to get a better understanding of the advanced usage and the words with cultural background. Improve reading comprehension while expanding English input.
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