脑珊瑚里的圣诞树管虫。

Christmas tree worms on brain coral.

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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.

youdao

松质石料：吸水石、芦管石、浮石、珊瑚石等。

Cancellous stone: water stone, flower, pumice, coral rock, etc.

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