主要物质
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principal or main material 主材
principal raw material 主要原料
principal abrasive material 主磨料
The judge accepted material gain may not have been the principal motivating factor and that the sentence would be damaging to other members of his family.
BBC: Fake doctor Abdul Pirzada jailed over CV lies
Principal investigator Joe Veverka from Cornell University said the alterations were driven by the process material loss as the comet orbited the Sun.
BBC: Stardust probe finds 'subdued' comet crater
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