As part of the formula, they measured a biological marker, total NNAL, which indicates the amount of exposure to the tobacco-specific lung cancer-causing agent NNK.
作为公式的一部分，他们测定了生物标记物——总nnal含量，它能够反应烟草特异致肺癌成分nnk的含量。
There are many forms of expression of passive sentences in Japanese, which is mainly displayed in various forms of the marker of the agent.
日语被动句有多种表现形式，其核心就是动作主体表现的不同。
There are many forms of expression of passive sentences in Japanese, which is mainly displayed in various forms of the marker of the agent.
日语被动句有多种表现形式，其核心就是动作主体表现的不同。
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