You've seen one, right? 你看过一次对吗

247. Draining the fluid will relieve the pressure.
     排出那些腹水 释放压力
248. Good, but don't schedule it. Do it.
     很好 但是不用预约 直接做就行了
249. You want us to do the procedure?
     你让我们来做这个吗
250. You've seen one, right?
     你看过一次对吗
251. Absolutely.
     当然
252. Well, now do one.
     那就去做吧
253. I've never seen one.
     我从来没见过

来自《实习医生格蕾 第一季 第九集 Grey's Anatomy S01E09》第 250 行