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。

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。

Proof of itinerary, including air tickets and hotel bookings.

提供路线，包括飞机票和酒店预订。

That fresh air, along with the bubble’s ultraviolet-proof plastic, helps moderate temperatures and keeps the greenhouse effect in check.

而新鲜空气通过防紫外线塑料隔膜调节室内温度并抑制温室效应。

With card-board, oil-cloth and canvas, she made the lattice-work air-proof and light-proof.

用一些纸板，油布和帆布她就让这些小个子防风又防晒了。