Rather than using a parabolic shape for the dish that would focus everything to a single point, they chose a spherical curve.

他们没有使用将所有东西都集中到一个点的抛物线形状，而是选择了球面曲线。

The Greek mathematicians know the properties of the parabola and so could have directed the assembly of small mirror pieces into the parabolic shape.

希腊数学家知道抛物线的性质， 因此可以将小镜子碎片组装成抛物线形状。