And during digestion, mammalian gut bacteria breaks down sulfur and amino acids containing sulfur to produce hydrogen disulphide, a gas with a smell resembling rotten eggs.

在消化过程中，哺乳动物肠道细菌会分解硫和含硫氨基酸，产生二硫化氢，这是一种气味类似臭鸡蛋的气体。