1.account for 说明

How do you account for the company's alarmingly high staff turnover?

你怎么解释这家公司高得令人忧虑的人员流动率？

2.to the edge of 边缘

The children lead me through the maze of alleys to the edge of the city.

孩子们领我穿过迷宫一般的街巷，来到城边!v3zDbT#Gop+fI9Q。

3.secret service 情报机关

Secret Service officer Robin Thompson spoke on behalf of his colleagues.

特工处官员罗宾·汤普森代表他的同僚发表了讲话iloz@;hwK_a。