a simple type of jet engine; must be launched at high speed
例句
用作名词 (n.)
The rockets give the planes and missiles enoughspeed to make the ramjet engine workable. 这种助推火箭为飞机和导弹提供足够的速度，以使冲压式喷气发动机可以开动工作。
A jet engine that propels aircraft by igniting fuel mixed with air taken and compressed by the engine in a fashion that produces greater exhaust than intake velocity. 冲压式喷气发动机，一种喷气发动机，靠燃烧发动机吸入和压缩的空气与燃料的混合物推进飞机，其排出空气的速度比吸入快。
美
