라이트너 단어장

Description

It is a vocabulary based on the lightner box system.
Saved words are recovered even after reinstalling the app by providing Google Cloud Sync.
The review cycle is as follows:
- Level 1: 1 day later
- Level 2: 2 days later
- Level 3: After 4 days
- Level 4 : After 8 days
- Level 5: After 16 days
- Level 6: After 32 days
If you answer correctly on the review day, you will advance to the next level. In case of incorrect answer, return to Level 1. It is a system that memorizes if you get the correct answer in the last level.