According to the relative positions of thermal coupled rectifying and stripping sections, the configurations of the system involved two types, symmetrical EHIDDiC and asymmetrical EHIDDiC.

根据精馏段和提馏段热耦合的相对位置不同，外部热耦合复合精馏塔系统可分为对称型和非对称型两种结构。

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This, coupled with the lack of marquee drawing power at the skill positions, largely explains what transpired in the first round.

FORBES: 2013 NFL Draft First Round Selections by the Numbers