龙的皮肤使它看起来像一片海藻。
一片区域的珊瑚死去后，那里通常很快就会被海藻占领，之后又会被海绵和软珊瑚占领。
Areas of dead coral are usually colonized rapidly by algae and often are later colonized by sponges and soft corals.
他跋涉过东部海湾区域的一片泥泞的沙滩，舀出了一团海藻，在这团海藻中栖息这很多贝类。
He slogs through a muddy beach in the eastern Bay Area and scoops up a clump of seaweed that's home to clams and snails.
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