1.radiate的基本意思是“发射,散发”,一般指物体从某一个中心点以光线或近似于光线的形式向四面八方发散出某种东西。引申可作“伸展”解。
2.radiate可用作不及物动词,也可用作及物动词。用作不及物动词时常与介词from连用,作及物动词时,接名词或代词作宾语。

radiate from(v.+prep.)
从…辐射〔发出,伸展出〕 (of lines or sth like lines) to show or take a direction outwards from (a centre)
▲radiate from sth
Light radiated from the window.光从窗户射进来。
Dangerous emissions radiate from plutonium.危险的辐射物从钚放散出来。
When the mist cleared, welcome warmth radiated from the sun.雾散去,太阳发出暖洋洋的光芒。
Roads radiate from the city in every direction.道路从城市通向四面八方。
Avenues radiate from the Arc de Triomphe in Paris.在巴黎,街道以凯旋门为中心向四方伸展。
This pattern shows lines of different colours radiating from a middle point.这图案表现了从中心点放射出的各种不同的色彩。
She radiated the happiness from her eyes.她的眼神中流露出了快乐。

用作及物动词
▲S+～+n./pron.
The sun radiates light and heat.太阳放射光和热。
The electric heater radiated warmth.电热器散发出热量。
Her face radiates joy.她的脸上洋溢着快乐。
She seemed to radiate inner contentment.她似乎流露出了内心的满足。

radiate, circulate, diffuse, disseminate, expand, extend, propagate, spread
参见spread条。