1.authentic
真实的；真正的， 确实的； 有根据的
authentic news可靠的消息
an authentic signature真实手迹签字
authentic document真实的文件
2.authority当局，官方
authority to spend from debt receipts动用借款的授权
3 automatic detain自动扣留
automatic adj.自动的
The heating system in the hotel has an automatic temperature control.
旅馆里的取暖系统是自动调温的。
detain vt. 使延迟， 阻止， 留住；扣留， 拘留
detain sb. as a suspect把某人当做嫌疑犯而加以拘留
I was detained by an unexpected caller that morning.那天早晨我被一个突然的来访者缠住了。
4.average平均n.平均数
The average of 4， 8， and 60 is 24 .4、8和60的平均数是24.
平均；平均水平
What is the average rainfall for August in your country？你们国家八月份的平均降雨量是多少？
His results is the average.他的成绩平平。
5. bank draft银行汇票