In the past, pads and tampons were typically whitened with elemental chlorine gas, a process that can create dioxins-a class of toxic, chlorinated compounds that can pollute the environment.
过去，卫生巾和卫生棉条通常都会使用含氯的气体漂白，而漂白过程总会产生破坏环境的二恶英。
2
The number of cationic bromine and chlorinecompounds is restricted.
溴、氯阳离子化合物的数量受局限。
3
Compounds formed when some or all of the hydrogen atoms in a hydrocarbon (typically an alkane) have been replaced with chlorine and fluorine.