We must repeat a thousand and one times that perseverance is the only road to success.
Explaining for Delaying
A： When are you going to give me the prototype you promised？
B： I apologize for the delay， Mr. Parker. We have been waiting on a piece from one of our factories. We should be able to have it completed by next week.
A： All right. But， I hope it wont take any longer than that！
B： I dont expect it too， Mr. Parker. I Appreciate your understanding.
我们必须千百次地反覆说明，坚韧不拔是取得胜利的惟一道路。
解释延误的原因
A：你打算什么时候把你答应过的模型交给我？
B：对不起，耽误您了，派克先生。有一个零部件我们一直在等着工厂送来。下星期会完成的。
A：好吧。但我希望不要比这再晚了！
B：我也不希望如此，派克先生。谢谢您能谅解。