1. an iridescent oil slick; nacreous (or pearlescent) clouds looking like mother-of-pearl; a milky opalescent (or opaline) luster. 
   彩色的浮油；看起来像珍珠母一样光芒四射的云彩；乳白色的、像珍珠一样的光泽。
2. channeling effect and blocking effect  
   沟道效应和阻塞效应
3. beneficial effect of forest 
   森林效益
4. effect of defence expenditure 
   国防费支出效果
5. effect of education expenditure 
   教育事业费支出效果

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