填空prohibitedX-ray scannersentrancesmetal detectorsgo throughfetch填空There are security channels in each station. Security staff are placed at the ____1__ of train stations with equipment like ________2______ and ________3_______. The passengers may have to wait in line a long time to ___4_______ security checks. They put all the luggage on the security check apparatus and then have themselves checked by security staff. Afterwards, they should pass the channel quickly and ______ their luggage. The __________ articles will be confiscated.第 4 个空填入的单词是