keep a poker face
面无表情
A:How is the result of your lab test?
A:你的检查结果怎么样?
B:When it comes to that, I've a lot to say.
B：说来话长了。
A:Then say it.
A:说来听听。
B:When I went back to my doctor to hear the results of my lab tests. I tried to keep a poker face even though I was scared to death. Then you guess what he said.
B：我去医生那儿看化验结果的时候，我害怕得要死，不过我还是硬装着没事儿一样，你猜他怎么说?
A:That's just what I want to know.
A:我想知道的也就是这个。
B:He told me the tests were negative and there was nothing wrong with me.
B:他说结果是阴性，我没事儿!