Helium's "Fort Knox" is the Federal Helium Reserve (FHR) near Amarillo, created in 1925 to supply a fleet of military dirigibles that never fully materialized.
负责守护氦的“诺克斯堡”是联邦氦储备系统(FHR)。FHR成立于1925年，当时的供给用于成立一个军用飞艇舰队，后来不了了之了。
Helium's "Fort Knox" is the Federal Helium Reserve (FHR) near Amarillo, created in 1925 to supply a fleet of military dirigibles that never fully materialized.
负责守护氦的“诺克斯堡”是联邦氦储备系统(FHR)。FHR成立于1925年，当时的供给用于成立一个军用飞艇舰队，后来不了了之了。
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