It's usually best to go to a doctor that someones has recommended.
            In an emergency, you should go directly to the emergency entrance of
            the nearest hospital. Medical services in the United States are
            generally very expensive.
            平时最好上别人推荐的医生那里去看病。紧急情况下，应该直接去最近医院的急诊室。美国的医疗费普遍昂贵。

            1.A: I have a sore throat and my chest hurts.
            B: How long have you been like this?
            A: Two or three days now.
            B: I think you've got the flu. There's a lot of it going around.
            A: What do you think I ought to do?
            B: Get this prescription filled and go straight to bed.

            2.A: I have the chills and an upset stomach.
            B: How long have you felt like this?
            A: For most of the week.
            B: It sounds as if you have a virus.
            A: What do you think I should do?
            B: I'll give you something. I want you to take it easy and come back
            in a couple of days.

            3.A: I feel dizzy and I have a headache.
            B: How long have you been sick?
            A: Since yesterday.
            B: You seem to be generally run-down.
            A: What can I do?
            B: It's nothing serious, but you'd better stay in bed for a day or
            two.

            4.A: I've got a temperature and my stomach hurts.
            B: How long have you been feeling this way?
            A: It all started the day before yesterday.
            B: You seem to have picked up some kind of infection.
            A: What should I do?
            B: Take a few days off from work and don't wear yourself out