光降解问题：阳光降解了漂浮废弃物，悬浮的塑料微粒使水面变得粘稠。
Photodegradation: : as sunlight breaks down floating debris, the surface water thickens with 40 suspended plastic bits.
反应性悬浮填料的使用也已取得一系列成功经验，但仍然要注意反应性悬浮填料本身在废水中的降解问题。
The usage of reactive suspended carriers has also gained a series of success, but the degradation of them in wastewater should be noticed and solved.
作者认为生物降解支架可以防止这些问题。
These issues may be averted by biodegradable stents, the authors maintain.
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