Even with the air pumped out the bulb, the tungsten filament slowly vaporizes.
Even with the air pumped out the bulb, the tungsten filament slowly vaporizes.
即使灯泡中的空气被抽出，钨丝也会慢慢地蒸发。
Even with the air pumped out the bulb, the tungsten filament slowly vaporizes.
即使灯泡中的空气被抽出，钨丝也会慢慢地蒸发。