\\\"propellant fuel for submarines\\\"
\\\"the faster a jet plane goes the greater its propulsive efficiency\\\"
\\\"universities...the seats of propulsive thought\\\"
造句
Something, such as an explosive charge or a rocket fuel, that propels or provides thrust. 發射藥，火箭燃料推進或提供爆炸的物體，比如爆炸炸藥或火箭燃料