It's just... 只是

475. and let her beat you to a pulp with her tiny and professional fists.
     让她用小拳头把你揍成肉饼
476. What?
     怎么了
477. Nothing.
     没什么
478. It's just...
     只是
479. Nothing.
     没什么
480. Oh! This one is skin grafting!
     噢 这盘录的是表皮移植
481. Skin grafting? no way! I've never seen that done.
     表皮移植 不会吧 我还没看过表皮移植呢

来自《实习医生格蕾 第一季 第三集 Grey's Anatomy S01E03》第 478 行