Besonderhede van voorbeeld: -2711938396291442492

Welsh

Radon: allwch chi mo'i weld, allwch chi mo'i ogleuo, allwch chi mo'i deimlo: fe allwch chi brofi amdano ( / )

English

Radon: you can't see it, you can't smell it, you can't feel it: you can test for it