The shift arm aperture line shall aligned with the engine main axle center line, without any displacement.

排挡臂开口线与引擎轴心对齐，不可偏移。

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An engine main pump test system was improved to be both applicable for pump test and fuel throttle valve test.

在长征系列发动机主泵试验系统现有的基础上经局部改造而建造了燃料节流阀试验系统。

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To simulate combined testing for all of the important bearings on aviation engine main shaft, a shafting bearing tester is designed.

为模拟航空发动机主轴轴系所有重要轴承联合试验，研制了航空发动机轴系轴承试验机。

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But economist Jack Strauss says credit conditions threaten the main engine of job growth since two thousand one small businesses.

VOA: special.2009.11.06

Mr. HEIRT NOELT (Belgian Asset Manager): Exports have been the main engine of growth in Europe, where as consumption and credit growth have been the main engine of economic growth in the United States.

NPR: In Europe, Excesses Blamed For Money Meltdown

This process repeats ad infinitum in the markets and is the main engine that creates value.

FORBES: Magazine Article

It houses two main engine rooms, a hospital complex, dentist, galley and accommodation, including 242 berths.

BBC: Section of HMS Queen Elizabeth carrier