后掩蔽

backward masking

empress / queen / (archaic) monarch / ruler

back / behind / rear / afterwards / after / later / post-

to cover up / to close / to surprise

to cover up; to conceal / to close (a door, book etc) / (coll.) to get (one's fingers etc) caught when closing a door or lid / (literary) to launch a surprise attack

shelter / screen / cover / protection

shelter; screen; cover; protection

to cover / to shield / to screen / to conceal