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belly tank /ˈbɛlɪ ˈtaŋk/ n

中文：机腹水箱

中文 · 机腹水箱Español · depósito ventralFrançais · réservoir ventral
Meaning：Tank filled with water by a long pipe hanging underneath; it uses a hatch to empty the water in flight.
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Firefighting helicopter

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