to screen; to shield; to cover; protection; cover; CL:面[mian4]

to conceal; to hide behind; to cover up

to cover up; to conceal; to mask; to gloss over

bunker (military)

to bury

to cover; to mask; to cover up or conceal (the truth etc)

to be secretive; to try to cover up (idiom)

to partially obscure; (of a door, gate or window) slightly open; ajar; not fully shut; unlocked; (of a jacket or shirt) unbuttoned

counter soldiers with arms, water with an earth weir (idiom); different situations call for different action; to adopt measures appropriate to the actual situation