[填空题]
A 35-g glass thermomeyfd o1zuiyf91r7:kj d ;v /,ce)3bu tsdd5 -: buvz4zxter reads 21.6$^{\circ} C$ before it is placed in 135 mL of water. When the water and thermometer come to equilibrium, the thermometer reads 39.2$^{\circ} C$ . What was the original temperature of the water?$T_{iH_2O}$ = $^{\circ}C $