Through PVA is excellent size, it is difficult to biodegrade and pollutes environment.

PVA虽上浆性能优良，但不易生物降解，严重污染环境。

youdao

Through PVA is excellent size, it is difficult to biodegrade and pollutes environment.

PVA虽上浆性能优良，但不易生物降解，严重污染环境。

youdao