Amazon calculates a product’s star ratings using a machine learned model instead of a raw data average. The machine learned model takes into account factors including: the age of a review, helpfulness votes by customers and whether the reviews are from verified purchases.
After downloading the app, you have to download every dictionary you want. The foreign ones are only available with the Pro edition which wasn't made clear beforehand. A lot of English words aren't available in English edition. Don't know why not. Possibly over-Americanised?
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