輕薄, 輕率, 無聊的舉動
frivolity n. 輕薄, 輕率, 無聊的舉動 ...
, clowning, japery, frivolity...
with an air of frivolity of security... of frivolity of security men, encountered...
n. 
輕薄, 輕率, 無聊的舉動n. n. n. 