Through chemicalreaction, hydrocarbons can be created.
通过化学反应，可以产生碳氢化合物。
2
The chemicalreaction that follows is very complex and continues for many years, and the concrete just keeps getting harder.
接下来的化学反应非常复杂，会持续很多年，混凝土只会变得越来越硬。
3
These bacteria actually combine the hydrogen sulfide with the carbon dioxide and this chemicalreaction is what produces organic material which is the food for larger organisms.