外文翻译,求高人帮忙翻译一下!急!谢谢!The thermal behaviour of TiO2-WO3-V2O5 catalysts with various vanadia contents (1, 2 and 3 wt.% V2O5) was investigatedusing X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy and BET surface areadetermination. The activity and selectivity of the new and thermally treated catalysts were tested in the SCR reaction. Bothstructural and catalytic investigations have shown that the vanadia content has a strong effect on the thermal behaviour of theSCR catalysts. The structural investigations evidenced anatase sintering, increase of polymeric vanadyl surface species andthree-dimensional growth of supported vanadia upon ageing. The catalytic tests have shown that the SCR activity of catalystscontaining 1 or 2% V2O5 increased upon ageing, whereas the SCR performance of the catalyst with 3% V2O5 decreased.The observed improvement of the SCR performance is attributed to an increase of the amount of polymeric vanadyl surfacespecies upon ageing. The decrease of the SCR performance of the catalyst with 3% V2O5 is due to the extensive loss of surfacearea and to the three-dimensional growth of supported vanadia upon ageing. The catalyst containing 2% V2O5 represents thebest compromise between high SCR activity and good thermal stability.其实我只是想知道文中的upon aging到底翻译成什么，告诉我这个怎么翻就行了~~谢谢~~
王蕾蕾_301
upon aging老化后
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四川省成都市金牛区金科北路1号迪欧时代8栋；四川省宜宾市江安县竹都大道世纪新城6栋1单元102号；成都市郫县犀浦万树森林1期1栋2单元509号。
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Unit 1, Yibin四川省成都市金牛区金科北路1号迪欧时代8栋, Sichuan, Diou Times, Chengdu, Project 1, Xinpu, Sichuan, No, Jinke North Road, Chendu, Unit 2, Building 6。Room 509, Shiji Xincheng, Pixian, Zhudu Avenue, China成都市郫县犀浦万树森林1期1栋2单元509号.1, Wanshu San, Sichuan, Building 1, Jinniu District, China四川省宜宾市江安县竹都大道世纪新城6栋1单元102号, Jiang&#39；Room 102；Building 8
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