他必须清楚这个巨大珊瑚形阴渠。

He must have been familiar with the enormous madrepore of the sewer.

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本文系统地论述了床板珊瑚形珊瑚的数值分类研究。

This paper discusses the numerical taxonomy of tabulate morph corals systematically.

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但是，要这样走，就必须彻底清楚这个巨大珊瑚形阴渠的所有分岔和直管。

But in order to do this, he must have been thoroughly familiar with the enormous madrepore of the sewer in all its ramifications and in all its openings.

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