事先安排

shí jì shang tā men zǎo yǐ shì xiān ān pái hǎo le

实际上他们早已事先安排好了。

In fact, they had already arranged it.

wǒ men yào shì xiān ān pái hǎo

我们要事先安排好。

We have to make arrangements in advance.

cān guān xū shì xiān ān pái

参观需事先安排。

Visits are by prior arrangement.