x=Abs[t]^2;
y=t^3;
r=0.5/(1+5(t-0.2)^2);
Plot[{x,y,r}, {t,-1,1}]

Graphics3D[{
CapForm[None], JoinForm["Miter"], Opacity[0.5],
Tube[
Table[{x, y,0}, {t,0,0.75,0.05}],
Table[r, {t,0,0.75,0.05}]
],
Tube[
Table[{x, y,0}, {t,-0.75,0,0.05}],
Table[r, {t,-0.75,0,0.05}]
]
}]