

Я средний ребёнок в нашей семье.
I'm the middle child in our family.
Положи эти книги на среднюю полку.
Put these books on the middle shelf.
Тебе удобно сидеть на среднем месте?
Are you comfortable sitting in the middle seat?
"средний" is in the lesson "Adjectives 5" (Level 38), along with 10 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.