Australian scientists fear the planet is on the brink of another mass extinction as ocean dead zones continue to grow in size and number.
澳大利亚科学家担心，随着海洋死区范围和数量不断加大，地球已到了另一次大灭绝的边缘。
Scientists say ocean dead zones, which vary in size from one square kilometre to 70, 000 square kilometres, have been found all over the world.
科学家们说已在世界各地发现，从一平方公里到七万平方公里大小不等的海洋死区。
And when the algae die, their remains are broken down by fungi and bacteria that suck up oxygen, creating ocean dead zones, Morton explained.
死亡后的海藻被真菌与细菌分解，吸收氧气，造成海水缺氧，形成大片的死亡之域。
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