At the dentist’s-(看牙医)
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A：I have a terrible toothache.
我牙痛得厉害。
B：Which tooth is it?
哪颗牙？
A：(Pointing) This one here.
（指指）这一颗。
B：Ah, yes. There’s a big cavity.
啊，是的。有个大洞。
A：Can you fill it?
能补吗？
B：I’m afraid not. The tooth is too far gone. It’ll have to be taken out.
恐怕不行。坏得太厉害了。只好拔掉了。
A：Then I might as well have it out now.
那还不如现在就拔呢。
B：You’d better wait. The gums are swollen. Take the medicine I prescribe and come back in three days.
还是等等吧。牙床肿了。吃我给你开的药，三天以后再来。
及物动词指定，规定; 指定，规定
不及物动词建立规定，法律或指示; 开处方，给医嘱