六级Rather than adding other metals, they developed a complex mechanical process involving repeated heating and very severe mechanical deformation, known as temp-forming.
他们没有添加其他金属,而是开发了一个复杂的机械过程,包括反复加热和非常严重的机械变形,称为温度成形。
2019年6月六级真题(第三套)阅读 Section A
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