ram-jet

n (also ram-jet engine) type of jet engine that uses air forced in by the speed of flight to burn fuel 冲压式喷气发动机.

raindrop, rainfall, rainforest, rainless, rainproof, rainy, raise, raise...out of, raisin, raison d'etre, raj, rajah (also raja), rake, rake-off, rakish, rakishly, rakishness, rallentando, rally, ram, Ramadan, ramble, rambler, rambling, rambunctious, ramekin, ramification, ramify, ramp, rampage, rampant, rampantly, rampart, ramrod, ramshackle, ran, ranch, rancher, rancid, rancidness,