I think you have made an error in calculating the total.
我想你在计算总数时出了差错。
We put an ad in the local paper.
我们在当地报纸上登了一则广告。
The government's policy is an open door to disaster.
政府的`政策为灾难敞开了大门。
This door should only be used in an emergency.
这道门只能在紧急情况下使用。
He's an expert at getting his own way.
他在如何达到自己的目的方面很在行。