在暗中看不清

unable to see clearly in the dark

暗中勾结

secretly collude

暗中监视

spy on

暗中活动

clandestine actions

暗中支持

tacitly support

暗中破坏

sabotage

暗中捣乱

make trouble behind the scenes

暗中不满

be secretly dissatisfied

暗中替别人着急

be secretly worried for others

表面是人, 暗中是鬼

have a human face but the heart of a devil