I want to plot the following solid nicely.

${(rhocosthetasinphi,rhosinthetasinphi,rhocosphi)inmathbb{R}^3mid(rho,phi,theta)in(1,2)times(0,frac{pi}{2})times(0,frac{pi}{2})}$.

The following code didn’t work:

```
ParametricPlot3D({r Cos(t) Sin(s), r Sin(t) Sin(s), r Cos(s)}, {r, 1, 2}, {s, 0, Pi/2}, {t, 0, Pi/2},ImageSize->Large, PlotStyle->Blue)
```

Please tell me how to do.