But proving this has been difficult because snatching a sample of the Mona Lisa's face for chemical analysis is, unsurprisingly, frowned upon.
但要证明这一观点则十分困难，因为要刮下一小块蒙娜丽莎的脸作为化学分析样本是无论如何都不可能得到允许的。
The sampling conditions, sample preparation and measure methods are discussed and the control points of chemical analysis of high carbon are pointed out.
对取样条件、试样制备、测量方法进行探讨，指出高碳钢化学分析的控制要点。
Artificial heavy concentrate tests were conducted on chemical analysis spare sample from Relangze Lead-Silver Mine.
对热朗泽铅银矿矿石化学分析副样进行了人工重砂试验。
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