What? 怎么了

304. Sometimes he'd have to brace himself to get out of bed.
     有时候他要强撑着才能起床
305. Could be a million things.
     有很多可能
306. Simple orthostasis.
     可能是单纯的低血压
307. What?
     怎么了
308. What made him fall with a nail gun?
     那他怎么会拿着射钉枪摔下来
309. He said he tripped.
     他说他绊倒了
310. Just because you hear hoofbeats, don't assume zebras.
     听见马蹄声 也不一定是斑马

来自《实习医生格蕾 第一季 第四集 Grey's Anatomy S01E04》第 307 行