unattended equipment

例句：

1. 1. The childwas left unattended by his parents while they went shopping.
   当父母去购物时，孩子被留置无人看管。
2. 2. The factory is unattended at night, which makes it easy for thieves to break in.
   工厂在晚上是无人看守的，这使得小偷很容易进入。
3. 3. The elderly couple lived together without any children, making their home unattended.
   这对老年夫妇没有子女，所以他们的家是无人照看的。