The insulating foam prevents ice from forming on the tank when it is filled with 500,000 gallons of supercold liquid hydrogen.
当容器内充满50万加仑的超冷液态氢时，绝缘泡沫可以防止冰在容器上形成。
The insulating foam prevents ice from forming on the tank when it is filled with 500,000 gallons (1.9 million liters) of supercold liquid hydrogen and liquid oxygen before liftoff.
为什么会脱落呢？在航天飞机被发射出去之前，它的外部燃料箱里会装满50万加仑（合190万公升）的极冷液态氢和液态氧。
The insulating foam prevents ice from forming on the tank when it is filled with 500,000 gallons (1.9 million liters) of supercold liquid hydrogen and liquid oxygen before liftoff.
为什么会脱落呢？在航天飞机被发射出去之前，它的外部燃料箱里会装满50万加仑（合190万公升）的极冷液态氢和液态氧。
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