非生物可降解螯合剂
nondegradable chelating agents
可生物降解材料
biodegradable materials
biodegradable material
biological degradability material
biodegradable polymer
bio-degradable material
可生物降解缓释微球
biodegradable microspheres
可生物降解汽轮机油
biodegradable turbine lubricant
可生物降解嵌段共聚物
biodegradable block copolymer
可生物降解润滑添加剂
biodegradable lube additive
biodegradable lubricating additive