高层: high level, high class...
不大: not very, not too, not often...
吞吞吐吐: to hum and haw (idiom); to mumble as if hiding sth, to speak and break off, then start again, to hold sth back...
俗语: common saying, proverb, colloquial speech...
方面: respect, aspect, field, side...
日常: daily, everyday...
许可证: license, authorization, permit...
关机: to turn off (a machine or device), to finish shooting a film...
坚硬: hard, solid...
就是说: in other words, that is...
