safety match

match that will only ignite when rubbed against a special surface, eg on the side of the matchbox 安全火柴.

sadness, sado-masochism, sado-masochist, sae, safari, safari park, safari suit, safe, safe conduct, safe deposit (US ,safe deposit), safe house, safe seat, safeguard, safekeeping, safely, safety, safety curtain, safety glass, safety island (also `safety zone), safety lamp, safety net, safety razor, safety-belt, safety-catch, safety-pin, safety-valve, saffron, sag, saga, sagacious, sagaciously, sagacity, sage, sage-brush, sagely, Sagittarian, Sagittarius, sago, sahib, said,