arrière-ban

例句：

1. 1. The manager had to open the arrière-ban to let his employees in.
   经理不得不打开后门让员工进来。
2. 2. She was caught by the police at the arrière-ban, hiding behind a bush.
   她在后门被警察抓住了，躲在灌木丛后面。
3. 3.The company's secret meeting was held through the arrière-ban.
   公司的秘密会议是通过后门进行的。