You better be. 你最好是

233. This is one of my oldest friends.
     那可是我的老朋友
234. You might want to take this seriously.
     你最好严肃点
235. I'm sorry, sir.
     对不起
236. You better be.
     你最好是
237. I got the rest of the labs back.
     我拿来了检查结果
238. They did a chromosome analysis of the tissue.
     他们对异物组织进行了染色体分♥析♥
239. You won't believe this.
     你不会相信的

来自《实习医生格蕾 第一季 第九集 Grey's Anatomy S01E09》第 236 行