“地核”造句

按一般標(biāo)準(zhǔn)衡量, 地核是由相當(dāng)致密的物質(zhì)組成的.
Judge by ordinary standards, the core is made of rather dense stuff.

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

一般認(rèn)為地核至少是外核由鎳和鐵構(gòu)成.
The earth's core, at least the outer one is believed to consist of nickel and iron.

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