extend, circulate, diffuse, disseminate, expand, propagate, radiate, spread

这组词都有“延伸”“延长”“伸展”“展开”的意思。它们的区别是：1.spread指向四面八方扩大范围。2.circulate指无拘无束地或不间断地传播、散布到各处。例如:She opened a window to allow the air to circulate.她打开窗户使空气流通。3.disseminate指到处传播思想、理论等。例如:They use the press to disseminate right wing views.他们利用报刊来传播右翼观点。4.diffuse指光线、声音、气味等在空中传送或散布。例如:Light diffused from the window.光从窗户射进来。5.extend指延展物体的长度、宽度,延伸或扩大某一事物,以及延长时间、期限等,也指伸开四肢或躯体。例如:They extended the road for three more miles.他们把那条路又延长了三英里多。The headmaster extended our holidays by a week.校长把我们的假期延长了一个星期。6.expand指扩大面积或体积,也指把合拢的东西放开(即三维)。例如:This county has expanded its area under cultivation by more than 50,000 mu .该县扩大了50,000亩耕地。Heat expands metals.热使金属膨胀。He does exercises to expand his chest.他做体操扩胸。7.propagate通常指宣传某种信念、看法或传播某种言论,以使