约定好 meaning in English

will you help me fix up this sheet

The farmer promised to be punctual to his appointment .
农民答应按约定好的时刻准时到来。
As if this had been a concerted signal, the back door was struck rudely .
仿佛是在按照一个事先约定好的信号行事，后门顿时被不客气地捶了起来。
Wishing them a good voyage, i see them go, agreeing with them about a signal they should hang out at their return .
我祝他们一路平安，送他们动身，一方面同他们约定好回来悬挂的信号。
Let ' s make a date to go shopping next thursday
让我们约定好下周四去商店。
They made a pact not to tell anyone
他们约定好绝不告诉任何人

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