求翻译：而本研究另外將複合薄膜進行長時間，間歇性測試，而在測試時間30天內，其薄膜氣體滲透選擇能力，並無明顯改變，說明複合薄膜的分離效能穩定性良好。是什么意思？

In this study, another composite film for a long time, intermittent testing, within 30 days of the test time, the thin film gas permeability selectivity did not change significantly, indicating good stability of the separation performance of the composite films.

正在翻译，请等待...

But this research other will bond the thin film to carry on the long time, the intermittent test, but in the test time in 30 days, its thin film gas seepage ability to select, and will change not obviously, the showing compound thin film separation potency stability will be good.

Study on composite film for a long time, intermittent tests, within the 30-day test, its thin film gas permeability of choice, and no obvious change description isolation effectiveness of composite film stability good.

正在翻译，请等待...