求翻译：两种地膜的环境降解特性可通过测定拉伸强度和断裂伸长率的变化来表征，有拉伸仪测得的数据知光降解地膜的环境降解特性优于普通聚乙烯地膜，从光降解地膜主要依赖于紫外光及Norrish反应的原理也可得知，因为当塑料大分子在吸收紫外线光量子后会处于激发态，从而具有降解的可能性。是什么意思？

Two kinds of environmental degradation feature film by measuring tensile strength and elongation at break to characterize the changes, there is tension meter measured data to know the environmental degradation of optical properties of degradable plastic film is better than ordinary polyethylene plas

Two types of surface coating of degradable environment can be measured through tensile strength and elongation, the changes in the tensile meter readings have known the data CD-biodegradable film environment of degradable superior to ordinary polyethylene film from the Optical biodegradable film, ma

Two kind of mulching plastic environment degeneration characteristics may attribute through the determination longitudinal strength and the break elongation ratio change, have the data which the stretch instrumental measurement results in to know the light degeneration mulching plastic the environme

Two species film of environment degradation characteristics may through determination stretching strength and fracture elongation rate of changes to characterization, has stretching instrument measuring was of data known light degradation film of environment degradation characteristics better than G