- can also be write as Exobiotics(外生性物質
- can be roughly grouped into 3:
- food(食物
- drug(藥品
- poison(毒，Ex.
- over-dosed drug
- pollutants such as dioxins and polychlorinated biphenyls
- 生活中的毒
- the relation between drug(藥品 and poison(毒 is that 「the dose makes the poison」（劑量決定毒性）
see also[]