早期的实验证明了这种现象，但是并不明确是由于硫化氢本身所起的作用，还是因为其间接的降低了老鼠的体温，从而导致新陈代谢的减缓。
Earlier experiments had demonstrated this effect, but it was unclear whether the gas was doing this itself or was acting indirectly by lowering body temperature, which also reduces metabolism.
报告排除了另一种早期的设想，即通过一个巨大的系留气球，用固定在上面的长长的管子向天空喷洒硫化物。
The study dismisses another blimpish idea, though: that of pumping sulphurous chemicals up a long pipe held aloft by a large tethered balloon.
长期以来，吸入硫化合物的能力一直被认为是由非生物世界向生物世界过渡的早期阶段。
The ability to breathe sulphur compounds has long been thought to be one of the earliest stages of transition from a non-biological to a biological world.
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