highly toxic substance

例句：

1. 1. The factory was closed due to the highly toxic substance in the air.
   由于空气中的有毒物质，工厂被关闭了。
2. 2. The doctors warned against using this highly toxic substance.
   医生警告不要使用这种高度有毒的物质。
3. 3. The research team found a new way to remove highly toxic substances from water.
   研究小组发现了一种从水中去除高度有毒物质的新方法。