Work has to be done on schedule and in a prearranged sequence.

工作必须按期并以预先安排好的顺序完成。

I answer with prearranged hand signals.

我用事先安排好的手势作答。

A couple's conjugal fate is prearranged.

他们的结合是美满的姻缘。

A meeting at a prearranged time and place.

在预先安排好的时间和地点的会面。

Turning off the lamp, he gives the prearranged signal.

关掉灯，他发出了事先约好的信号。