confidential
a.秘(机)密的;表示信任的;担任机密工作的
a confidential government report一份机密的政府报告
trail
vi.拖，下垂;失败 vt.跟踪 n.小路;踪迹
A plane trailing a banner was circling overhead.一架飞机拖着横幅标语在上空盘旋。
trait
n.特征，特点，特性
a mental illness associated with particular personality traits和某些性格特征有关的精神疾病
transaction
n.交易，业务
The bank charges a fixed rate for each transaction.
银行对每一笔业务都收取统一费用。
