几个广告飞艇在城市上空缓慢飘过。

Several advertising ___blimps floated slowly over the city.

那个自称'移动沙发'的家伙，在健身房简直像个飞艇一样显眼。

The guy who calls himself 'the walking couch' stands out in the gym like one of those ___blimps.