聚乙烯具有力学性能好、无毒、相对密度低、的翻译：Polyethylene has good mechanical properties, nontoxic, low relative density, 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

Polyethylene has good mechanical properties, non-toxic, relatively low density,

Polyethylene has good mechanical properties, nontoxic, low relative density,

The polyethylene has mechanics performance well, non-toxic, the relative density low,

Polyethylene mechanics good performance, non-toxic, and relatively low density,

Polyethylene has good mechanical properties, nontoxic, low relative density,