Most of the world oil has been biodegraded.

全球石油大多遭受过生物降解。

Lighter the crude oil is, faster will it be biodegraded.

原油的油质越轻，生物降解的速度越快。

PLA fiber is a new environmental protection fiber, which can be biodegraded.

玉米纤维是一种可完全生物降解的新型环保纤维。

CPC was slowly biodegraded with the bone graft resorption and new bone regeneration.

CPC随着新骨的形成及改建塑形逐步缓慢降解。

After crude oil has been biodegraded, the parameters of saturated hydrocarbon in GC analysis should be changed.

原油遭受生物降解后，饱和烃色谱参数产生变化。