朝三暮四: say three in the morning but four in the evening (idiom); to change sth that is already settled upon, indecisive, to blow hot and cold...
燕子: swallow...
聚精会神: to concentrate one's attention (idiom)...
防: to protect, to defend, to guard against, to prevent...
打交道: to come into contact with, to have dealings...
乐队: band, pop group...
私营: privately-owned, private...
