enshroud  
verb [ T ] uk/ɪnˈʃraʊd/ us/ɪnˈʃraʊd/
  (COVER)      
  literary遮蔽;笼罩;掩盖 
to cover something so that it cannot be seen clearly
  The planet Venus is enshrouded in thick clouds. 金星笼罩在厚厚的云层中。 
   (KEEP SECRET)      
 保密;掩盖真相
to make something difficult to know or understand
  The whole affair was enshrouded in secrecy. 整个事件是保密的。