However I'm a little curious that how do you know they make appointment?

不过我有一点好奇，你怎么知道他们是预约的？

youdao

You university is not in Shenyang, why you make appointment in Shenyang?

你的学校不在沈阳，为什么在沈阳签证？

youdao

He would make an appointment with him to straighten out a couple of things.

他想同他安排一次约会以理清几件事情。

《柯林斯英汉双解大词典》

He advises students to make an appointment at an American embassy or consulate as soon as they are accepted to a school.

VOA: special.2009.06.11

If their blood pressure is too high, they are advised to make an appointment with their doctor.

VOA: special.2010.12.06

To do that,go to chea.org As soon as you are accepted, make an appointment for a visa interview at an American embassy or consulate.

VOA: special.2009.07.16

It's only a question of whether that governor has the power to make the appointment that the Constitution says a governor can make.

NPR: Legality Of Blagojevich Appointment Examined

Make one appointment for you and your parent with just one of these as as start.

FORBES: How To Have A More Positive Relationship With Your Aging Parent

Under government security guidance, anyone wishing to see the plans must make an appointment.

BBC: William and Kate: 'Royal house' plan viewers face vetting