cluster ballooning
plural of Franze
A form of ballooning where a harness attaches the balloonist to a cluster of helium-inflated rubber balloons.
(mathematics) A prime number that is one more or one less than a factorial. For example, 7 is a factorial prime, since 3! + 1 = 7.
The condition of being quartic
数か月の訓練を経て、彼女はついにハーネスで体をつなぎ、ヘリウムで膨らませた何十個ものゴム風船の束に吊られて浮かぶ一種の気球飛行に挑戦した。
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