不定冠词an的例句

1、The governments policy is an open door to disaster.

2、This door should only be used in an emergency.

3、Hes an expert at getting his own way.

Lack of money will have an adverse effect on our research programme.

缺少资金将对我们的研究方案有不利影响。

It\'s an ideal proving ground for the new car.

这里是个理想的新车试验场。

Always make a backup disk as an insurance policy.

为保险起见，每次都要做备份磁盘。