难熔的内含物中的那种矿物质，也被认为是最早形成的太阳星云凝结的物质。

The same minerals that occur in refractory inclusions are believed to be the earliest-formed substances to have condensed out of the solar nebula.

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公司现在拥有难熔金属的加工设备。

The company now has a refractory metal processing equipment.

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泡沫型模用难熔材料覆盖。

The foam pattern is coated with a refractory material.

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