Five series ductile iron elements of hyper eutectic, hypo eutectic, eutectic have been tested using color metallograph method.

利用彩色金相对过共晶和亚共晶球铁磨球五组试样进行了试验对比。

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The lunar soil (regolith) contains iron, aluminum, calcium, silicon, titanium, and oxygen, as well as trace amounts of lighter elements such as carbon, sulfur, and nitrogen.

月球的土壤(风化层)含有铁、铝、钙、硅、钛和氧等元素，此外还发现有大量较轻元素如碳、硫和氮等。

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Unlike most supernovae, this one spewed lots of elements far heavier than iron, including radioactive thorium and uranium.

这颗晕星不同于大多数超新星，它吐出的许多元素比铁还重，其中包括放射性钍和铀。

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Now in this particular reaction, I've got hydrogen gas, iron solid. Those already are elements in their most stable forms at room temperature and pressure.

特定的反应中，我有氢气,固态铁，这些都已经是,处于室温和常压下,最稳定的元素单质。

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Instead, these giants may simply have dumped all their contents back into space, dispersing heavy elements like iron equivalent to the mass of 10 of our Suns.

BBC: Astronomers detect 'monster star'

In 1957, he and three colleagues wrote a paper showing how elements heavier than iron are produced.

ECONOMIST: Sir Fred Hoyle

In theory, making elements up to iron should not be hard.

ECONOMIST: Sir Fred Hoyle