

Шахматы хорошо тренируют мозг.
Chess is good training for the brain.
Без сна мозг плохо работает.
Without sleep, the brain doesn't work well.
Учёные до сих пор изучают работу мозга.
Scientists are still studying how the brain works.
"мозг" is in the lesson "Body parts 1" (Level 2), along with 14 other useful words. LinDuo has 180 topic lessons like this one, 2,380 words in total. Every word has an illustration, a transcription and pronunciation in a female and a male voice. Just 10–15 minutes a day is enough to learn them all. Free, and works offline.