记忆方法
双解例句
小知识
Radar is a system for locating objects by bouncing radio waves off of them. Air traffic controllers use radar to keep track of exactly where airplanes are.
Radar is a scientific method of figuring out where objects are — it's used today by the Coast Guard, astronomers, and the military, among others. Researchers in the late 1800's and early 1900's realized that radio waves could be reflected off solid objects, and by World War II radar was frequently used to detect ships and planes. The name radar is a shortened form of the phrase “radio detecting and ranging.”
实用短语
常用短语
单词用法
phased array radar相控阵雷达
weather radar天气雷达
radar echo雷达回波
词根词缀
词根: radi
表示”辐射,光线”
adj.
radiant 发光的, 辐射的, 容光焕发的radi辐射,光线+ant……的→adj.发光的, 辐射的, 容光焕发的
radioactive 放射性的,有放射能的radi辐射,光线+o状态+active积极的, 能起作用的→adj.放射性的,有放射能的
n.
radar 雷达, 电波探测器rad=radi辐射,光线+ar器→n.雷达, 电波探测器
radial 光线, 射线radi辐射,光线+al表名词→n.光线, 射线
radiation 发散, 发光, 发热, 辐射, 放射, 放射线, 放射物radiate[v.发光；放射，辐射；散布，传播]+ion表名词→n.发散, 发光, 发热, 辐射, 放射, 放射线, 放射物
radiator 散热器, 水箱, 冷却器, 电暖炉, 辐射体radiate[v.发光；放射，辐射；散布，传播]+or物器→radiator散热器, 水箱, 冷却器, 电暖炉, 辐射体
radio 收音机，无线电radi辐射,光线+o物→收音机，无线电
radioactivity 放射性，放射现象radi辐射,光线+o状态+activity活动→n.放射性，放射现象
radium [化]镭radi辐射,光线+um→镭是一种高度放射性的金属元素
radius 辐射光线radi辐射,光线+us→辐射光线
v.
radiate 发光；放射，辐射；散布，传播radi辐射,光线+ate表动词→v.发光；放射，辐射；散布，传播
radio 用无线电通讯radi辐射,光线+o物→收音机，无线电