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。
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。
The representative chemical index and the typical water sample were obtained by means of absolute value correlative analysis and Q type factor analysis respectively.
用绝对值关联分析和Q型因子分析等方法得出了地下水中具有代表性的化学指标和具有代表性的水样。
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