But it's exactly what is required for polar bears, ring seals, and the snowy-white beluga whales — the highly vocal canaries of the sea.
而那正是北极熊、环纹海豹和海洋高音金丝雀——雪白的白鲸所需求的。
2
Over geologic time the central volcano becomes extinct, followed by erosion and subsidence beneath the sea surface, leaving the coral reefs as a ring around (or cap on) the submerged island remnant.