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This is the main body of the paper some background of main content material.
这是本文主要内容的一些背景材料。
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And the hardness of the weld account for 70 percent of the main body material.
同时发现焊接区的硬度约为母材硬度的70%。
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And the hardness of the weld account for 70 percent of the main body material.
同时发现焊接区的硬度约为母材硬度的70%。
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