- that an early warning system is essential.
所以即时预警设备是最重要的 - Bats survive by staying close to the skylights,
蝙蝠之所以能生存是因为 它们始终呆在天窗附近 - but venturing deep into the cave is very dangerous indeed.
但是深入洞穴必然极度危险 - The source of these toxic fumes lies several miles below.
这些毒气的源头位于地下几英里处 - Hydrogen sulphide gas bubbles up from oil deposits in the earth's crust.
硫化氢气体从地壳内的油气储层中溢出 - It mixes with oxygen and the water,
与水中的氧发生化合反应 - and forms sulphuric acid.
产生了硫酸
The source of these toxic fumes lies several miles below. 这些毒气的源头位于地下几英里处
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