Usage:
*Choose words you want to learn in lesson list, they will appear inlearning list (list with sword symbol)
* For each time you review the meaning, you gain 1 star for thatword.
*Collect 4 star to move that word to next level.
Wood->Silver->Gold->Diamond(master)
*If you don't review word for a day, you lose your stars. Besidesyou can gain more than one star for a word in 2 hours
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