reloj de arena
/kˌoɾtaðˈoɾ ðe ˈweβos ˈðuɾos/
n
English: egg timer · 煮蛋计时器
Significado：Device with two glass vials, one of which is filled with sand; the flow of the sand between the vials measures a precise time period.
English: egg timer · 煮蛋计时器