进出: to enter or exit, to go through...
散文: prose, essay...
密封: to seal up...
缺陷: defect, flaw, physical defect...
通行: to go through, to pass through, to be in general use...
奶: breast, lady, milk...
白白: in vain, to no purpose, for nothing, white...
开玩笑: to play a joke, to make fun of, to joke...
眼色: signal made with one's eyes, meaningful glance...
见义勇为: to see what is right and act courageously (idiom, from Analects); to stand up bravely for the truth, acting heroically in a just cause...
