1. You need to repeatedly recall your memory, according to the "Forgetting Curve".
  2. You have no time to memorizing words.
  3. You feel so bored to repeat memorizing words.
  4. You always forget to review the memorized words, so they will disappear in your memory.

  1. It will remind the word to you according to "Forgetting Curve".
  2. It pushs words to you, so you will never forget review words.
  3. You can use it when you are working or doing something other, so you don't need to spend 1 or 2 hours a day on this boring job.