The terminology is a basic ladder in language learning. Note that many students said reading English enough. But it is not a translation, it is because the vocabulary in the brain also is less.
Vocabulary is a step in language learning. Be noted that many students say that reading English translations not bad, but that was because of lexicon in the brain is also less.
Vocabulary is the basic step in language learning. Will notice that many students said he read English, but does not stop. That is เพราะว่าคลัง vocabulary in the brain is an understatement.