答案可能与它们以幼虫形式随着洋流漂流到新的喷气口的后代有关。
The answer might involve their offspring, which in their larval form drift in the currents to colonize new vents.
喷气口四周的岩浆冷却凝固之后。
这里分布着十几个火山喷气口。
There are more than ten eruptive vents distributed over this area.
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