catapult
US /ˈkæt̬.ə.pʌlt/
UK /ˈkæt̬.ə.pʌlt/

1.
投石機, 彈射器
a device in which a tensioned arm is suddenly released to hurl a projectile
:
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The ancient army used a catapult to launch large stones at the castle walls.
古代軍隊使用投石機向城堡牆壁發射巨石。
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Modern aircraft carriers use steam-powered catapults to launch jets.
現代航空母艦使用蒸汽動力彈射器彈射噴氣式飛機。