地核

Judge by ordinary standards, the core is made of rather dense stuff.

按一般标准衡量， 地核是由相当致密的物质组成的。

The earth has a core and a mantle around it.

地球的中心是地核，地核的周围是地幔。

The earth´s core, at least the outer one is believed to consist of nickel and iron.

一般认为地核至少是外核由镍和铁构成。

Internally the earth consists of two parts a core and a mantle.

地球内部由地核和地幔两部分组成。

Therefore our knowledge of the core is quite incomplete.

因此我们对地核的认识还非常不全面。