Airline passenger volume has dropped by 20 percent.

航空客运量已经下降了20%。

The passenger volume this May was not as big last May.

今天五月的客流量没有去年的大。

Passenger volume during the Spring Festival suffered its first decline in 23 years.

春节期间的客流量遭受23年来首次下降。

Passenger volume has increased at Pudong International Airport since the Expo.

自世博以来，浦东国际机场的客流量就增加了。

Thirdly, the hidden safety problems are caused by the extremely large passenger volume.

换乘枢纽超大规模客流产生安全隐患。