a poisonous substance like cyanide的用法和样例：
- The toy is made of a poisonous substance.
- Antitoxin is substance that acts against a poisonous substance and prevents it from having a harmful effect.
- A poisonous substance secreted by a microorganism and released into the medium in which it grows.
- The witchweed steals water and nutrients from the roots and attacks the sorghum with a poisonous substance.