To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyses reviews to verify trustworthiness.
Not good, words are not provided with their meaning, main heading word is without meaning but has a example sentence and it's synonyms are listed without meaning and example sentence. If anything good in this book is available is it some simple and terse collocations.