[填空题]
In an internal combuowfidw 9xq -z3m)x 8f,stion engine+jx 2gstwbj +7, air at atmospheric pressure and a temperature of a+b72g w+sjjt xbout 20$^{\circ} $C is compressed in the cylinder by a piston to $\frac{1}{9}$ of its original volume (compression ratio = 9.0). Estimate the temperature of the compressed air, assuming the pressure reaches 40 atm. $^{\circ} $ C