Nitric oxides are one of the main air pollutants.

氮氧化物是主要的大气污染物之一。

youdao

Of the two main air compressor types for reciprocating (piston) and rotary (screw).

两种主要的空压机类型为往复式(活塞式)和旋转式(螺杆式)。

youdao

Its shielded box should be used the main air gap and prevent the primary current to produce the magnetic field concentrating in the shield shell metal plate.

其屏蔽盒应用主气隙，防止原电流产生的磁场集中在屏蔽壳的金属板内。

youdao

Mister Zundt says diesel vehicles are the main cause of air pollution in Sao Paulo.

VOA: special.2009.09.07

At Rhein-Main Air Base in Frankfurt, flights increased dramatically from mid-afternoon Sunday to mid-day Monday.

CNN: Finally, troops leave Germany for Bosnia

Rebels opposed to President Laurent Kabila in Congo captured Kindu, the government's main air base and headquarters in the east.

ECONOMIST: Close call

About 4, 500 people work across the 1, 200-acre site (485 hectares), which is one of the Royal Navy's two main air bases.

BBC: No more job cuts at RNAS Yeovilton says Commodore Alexander