第一次检查应该在这个地方或之前完成，而第二次检查将通过常规检查渠道完成。
The first check should be done at or before that point, while the second should be done at regular inspection channels.
第二种渠道是教科书市场，虽然这个层次可能不太适合本科生，我们看到它被用在研究生的课程当中，作为间接的阅读材料。
The second channel is the textbook market. Although the level is probably not appropriate for undergraduates, we see it being used in graduate courses, perhaps as collateral reading.
第二个渠道是商品价格。
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