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

Proof of itinerary, including air tickets and hotel bookings.

提供路线，包括飞机票和酒店预订。

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