- gas-proof (1)
[gas-proof 词源字典]
- "Impermeable to (especially poisonous) gas; gas-tight", Mid 19th cent.; earliest use found in Boston Daily Atlas. From gas + proof.[gas-proof etymology, gas-proof origin, 英语词源]
- gas-proof (2)
- "To make (an enclosure, material, etc.) gas-proof", Mid 19th cent. From gas-proof.