arsenic trioxide

In the 19th century, arsenic trioxide was commonly used in wallpaper pigment.

19世纪，三氧化二砷常被用于墙纸颜料。

The chemistry professor warned that arsenic trioxide is highly toxic and must be handled carefully.

化学教授警告说，三氧化二砷毒性极强，必须小心处理。

The poison in the novel was identified as arsenic trioxide, also known as white arsenic.

小说中的毒药被确认为砒霜，也称为白砒。