After this carrier delivers the drug load to the brain, it would break down by biodegrading.

在经过运送后，药物到达大脑，然后通过生物。

Because landfills are usually airtight beneath the surface, paper and plastic are equally bad at biodegrading.

因为垃圾填埋场都是密封的，纸袋和塑料袋在分解的时候都是一样糟糕。

And the dispersed oil has not exactly gone: it simply has a better chance of biodegrading, and less chance of coming ashore.

分散的石油也没有消失：石油更有可能生物降解，而不是走上岸。

Coming from plant or cotton fibre, cellulose is a macromolecular polysaccharide material with good chemical and biodegrading properties.

纤维素来自于植物纤维或棉纤维，是一种多聚糖高分子材料，具有良好的化学反应性能和多种降解性能。