1、It is important to use biodegradable materials to reduce environmental pollution. 使用可生物降解的材料以减少环境污染是很重要的。

2、Some plastic bags are labeled as biodegradable, but they may actually take hundreds of years to break down. 有些塑料袋标注为可生物降解，但实际上可能需要数百年才能分解。