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。
2
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。
3
The characteristic, equipment and technology of preparing zinc powder using air-proof submerged arc furnace are discussed, on the other hand, the plant practice is also introduced.