而唾液正像一道保护牙齿的屏障，把橘子等酸性食物以及细菌分解食物产生的酸性物质中和掉。

Saliva acts as a barrier, protecting the teeth by neutralising acidic foods such as oranges, and the acid produced by bacteria as they break down foods.

生活在人体大肠中的细菌分解食物后，释放出气体，产生肠胀气。发酵过程是的食物比先前更容易吸收。

Flatulence is gas released by bacteria that live in the large intestine when they break down food. Fermenting makes food more digestible earlier on.

细菌分解掉这些沉积物和其他有机物质，最后一起变成成吨的淤泥，淤泥成就了又一个全新的栖息地。

Bacteria break down the trapped sediment and other organic material, helping create tons and tons of sticky mud, a whole new home for wild life.

另一方面，从粪便中获取能量的生化过程通过消化器中的厌氧细菌分解废物；常见的消化器有密封舱和盖泻湖。

On the other hand, the biochemical process to get energy from manure breaks down the waste through anaerobic bacteria in a digester: an airtight tank or covered lagoon.