矿工们将含有朱砂的岩石切成一块一块的，朱砂是水银的主要商业来源。
Miners hewed chunks of rock veined with cinnabar, the main commercial source of mercury.
所有商业来源的化学药品都是试剂级别的，不经过纯化即可使用。
All chemicals from commercial sources were of reagent grade and used without further purification.
但是需要证明产品的外观具有表明产品商业来源的功能，而不是产品自身的特性。
It is necessary to prove that the appearance of the product has the function of indicating the trade source of the product, rather than just being a property of the product itself.
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