求翻译：近年來商業型高分子薄膜分離已廣泛運用於氣體分離上，但高分子薄膜雖然有很好的選擇率，可是卻有滲透率不佳以及機械強度等問題。是什么意思？

The separation of commercial polymer films in recent years has been widely used in gas separation, polymer films, though there is a good choice rate, but there is poor penetration and mechanical strength.

In recent years commercial polymer film separation gas separation has been widely applied, but polymer film while there is good choice rate, but there penetration rate is not good and mechanical strength.

In recent years the commercial high polymer thin film separation widely has utilized in the gas separation, but high polymer thin film although has the very good selectance, but has the penetration coefficient actually questions and so on not good as well as mechanical strength.

In recent years commercial polymer has been widely used in gas separation film separation, but the rate of polymer film although there is a good choice, but there are issues such as poor permeability and mechanical strength.

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