What are the other two?

另外两个呢

and a speech from a scientist named Hayden Posner,

和一个叫海登·波斯纳的科学家的演讲

Although not any of Hypatia works remains,

尽管希帕蒂娅的成果 没有被保存下来

well-known for the mathematical study of conical curves.

并且以对圆锥曲线的研究而著称

A brilliant explanation!

绝妙的演示

They say he has transformed the old fort at Chatillon

听说他将沙蒂的老城堡

And the smallest one is Pluto.

最小的一颗是冥王星

Okay.

好的

so roughly about 20,000 pounds.

也就是两万磅左右

and to observe an eclipse.

去观看月食

it is like the planets revolving around the sun.

就像行星围绕着太阳旋转一样

the occurrence of eclipses, all those things,

月食的发生 以及所有的事情