Air operated namely USES the air pump and the air valve control air current, the positive governing barometric pressure and the current capacity, enable the air to have the vibration.

气动即采用气泵和气阀控制气流，直接控制气压和流量，使得空气发生振动。

youdao

This drastic change of heart must very well be the result of the Romney loss and the realization that if the Republicans want to be a positive factor in governing they must be realistic and give up their fervent opposition to any taxes at all.

FORBES: John Boehner Offers Obama A "Grand Bargain" Over the Fiscal Cliff

Mr. LUIS RAMOS (National Assessment Governing Board): The positive of this is the fact that we are capable and focused on disaggregating the data.

NPR: Mixed Report Card for U.S. Schools

But Christie, who was banned for two years after testing positive for steroids in 1999, wants governing bodies to play an enhanced role in informing testers of athletes' whereabouts.

BBC: SPORT | Athletics | Christie defends Ohuruogu slip-up