后来我们使用了这个星球上一类热稳定性最高的材料——因瓦合金(一种镍铁合金)制作镜框。

And then, by going with this open frame, we use invar [a nickel-iron alloy], one of the most thermally stable materials on the planet.

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研制出一种滚镀镍铁合金新工艺。

A new process of barrel Ni-Fe alloy plating was developed.

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