propulsion
propulsionnoun- [mass noun]the action of driving or pushing forward
推进
they dive and use their wings for propulsion under water.
它们潜入水下,用双翼推进。
派生propulsiveadjective语源- early 17th cent. (in the sense 'expulsion'): from medieval Latin propulsio(n-), from Latin propellere 'drive before (oneself')
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