scatter: implies the action of a force that drives parts or units irregularly in many directions: the bowling ball ~ed the pins.  （又如after dinner, everyone scattered用餐后，大家各奔东西，如scatter the grass seed over the lawn把草籽撒到草坪上，如they scattered his ashes at sea他们把他的骨灰撒向大海，如he who is not with me is against me, and whoever does not gather with me scatters不和我一起的就是反对我的，不和我聚集的必将分散）


disperse: implies a wider separation of units and a complete breaking up of the mass or group: police ~d the crowd.


dissipate: stresses a complete disintegration or dissolution and final disappearance: the fog was ~d by the morning sun.  （disintegrate破碎解体，一般指物质分裂开或者组织变得不团结不完整，如at 420mph the windscreen disintegrated挡风玻璃在时速420英里时破碎，dissolution溶解、正式结束means to mix with liquid or to end formally，如dissolution of marriage/company/contract/the Soviet Union婚姻结束/公司解散/合同废止/苏联解体）


dispel: stresses a driving away or getting rid of by or as if by scattering: an authoritative statement that ~led all doubt.


scatter散开撒播: 指各组成部分单元，向各方向不规则地分散，disperse驱散开、油雾散开: 表示使散得更开，人群等彻底分离，dissipate解体散尽浪费: 强调完全解体并消失，dispel驱散、消除(怀疑情绪感觉等): 强调驱除消除疑虑想法等。


记忆方法: 1）首字母SDDD大大的傻<==分散不团结

         2）分散的意思是使分开mean to cause to separate or break up.