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