If the protective seal is not air proof or poor gas purity, it will also bring welding quality problems.

气路有密封不好的问题，或气体纯度不高，也会引起焊接质量问题。

youdao

Experimental analysis was conducted to study launching equipment damage caused by open delay of air proof cover.

针对密封盖未及时开启造成发射装置的损坏问题进行了实验分析。

youdao

It is proved by the experiments that the quality of air-proof of the device is very important for realizing the non-oxidation healing.

实验表明：系统的密封质量对能否实现无氧化加热至关重要。

youdao

Another resident, Shashikant Salunke, who works for Air India, worries that by surrendering his proof of residence, he'll be left in limbo.

FORBES: Billionaires List