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It's the same principle as a catapult.

这与弹射器是一个道理。

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Last year, Mexican authorities seized a catapult that was used to launch bundled drugs, Lopez said.

CNN: Mexican police nab drug-launching cannon near border

He's rigged up a catapult to his mini-fridge, a tiny elevator to carry the beers activate a doll with a remote control - and voila, a beer-tossing machine.

NPR: Four Years of College Yield a Beer Catapult

"I haven't seen a single one of these things stick their initial landings or catapult a pre-existing series to new heights, " he said.

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