在古罗马时期，奴隶被迫在恶劣的条件下工作。

In ancient Rome, ___slaves were forced to work under harsh conditions.

她沉迷于社交媒体，成了手机的奴隶。

She's become a ___slave to her phone, constantly checking social media.

这个外部硬盘被设置为电脑的从属设备。

This external hard drive is configured as a ___secondary to the computer.