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Oxygen is circulated around the helmet to stop the visor misting.
头盔内有氧气循环流动，除了供氧，还可以防止面罩雾化。
youdao
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L Oxygen is circulated around the helmet to stop the visor misting.
头盔内有氧气循环流动，除了供氧，还可以防止面罩雾化。
youdao
-
L Oxygen is circulated around the helmet to stop the visor misting.
头盔内有氧气循环流动，除了供氧，还可以防止面罩雾化。
youdao