Level 5 · word 11,132 of 20,000
radon
/ˈreɪˌdɑːn/
American
- n. 氡
- Definition
- n. a colorless radioactive gas found in small amounts in the earth
- Example
- Homeowners should test their basements for dangerous radon gas.
- 房主应该检测地下室是否存在危险的氡气。
Word mapChemical elements