To be more exact:

When you have vocabulary less than 5000, you can use Shanbay Vocabulary to memorize words

When you have vocabulary more than 5000, Shanbay Vocabulary (or any other words memorizing app) is not very effective

回復 @啊啊是誰都對：Yes, when you meet new words in Shanbay Reading, you can add it to your new words list of your Shanbay account directly. Then the Shanbay Vocabulary app will help you to review words

But when you have Vocabulary more than 5000, I don't recommend Shanbay Vocabulary, I only recommend to use English-to-English dictionary and to memorize English explanations of a word (Actually Shanbay Vocabulary does also have Collins' English-to-English dictionary by words memorizing)