They take hundreds of years to biodegrade and have sparked heated debates in cities from san francisco to mumbai 从旧金山到孟买的各大城市，塑料袋激起了激烈的争论。
2.
Do they just float around in some form of limbo , doomed to always exist and never biodegrade 那些所有，是否并未消亡，只以某种形态存在于地球的某一处，注定要永恒存在无法自然消解？
3.
The plastic bottles it comes in take 1 , 000 years to biodegrade , and in industrialised countries , bottled water is no more pure and healthy than what comes out of the tap 用来装水的塑胶瓶需要1千年才能被生物分解掉；而在工业化国家，瓶装水并没有比自来水更加纯净、健康。
4.
With the increase in pesticide wastewater of compounds that are difficult to biodegrade , conventional biochemical treatment methods cannot completely remove contaminants from wastewater 摘要随着农药废水中难生物降解化合物的增加，常规的生化处理方法无法完全去除水中的污染物。
