“地核”造句

按一般标准衡量, 地核是由相当致密的物质组成的.
Judge by ordinary standards, the core is made of rather dense stuff.

地球的中心是地核,地核的周围是地幔.
The earth has a core and a mantle around it.

一般认为地核至少是外核由镍和铁构成.
The earth's core, at least the outer one is believed to consist of nickel and iron.

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