An airship depends on a gas that is lighter than air. 而飛艇依靠的是一種比空氣輕的氣體。
It isn't as responsive to his thoughts as the puddle jumpers were, but then nothing will be unless the Air Force builds a new one from their schematics. 這感覺絲毫不能和他想念的小飛艇比，可一個飛艇都沒，除非空軍按他們的圖紙造個新的。
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