人造板机械的噪声主要有机械噪声和空气动力性噪声。
The noise of wood-based panel machinery mainly includes mechanical noise, air dynamic noise, etc.
发动机噪声是汽车噪声源的主要部分，它是由多种声源发出的噪声组合而成的，主要包括空气动力噪声和机械噪声和燃烧噪声。
Engine noise is the greatest part of the vehicle noise, it consists of many kinds of noise especially gas kinetic noise, mechanical noise and combustion noise.
车队开发的新一代空气动力学套件、引擎和改进的机械系统，将在德国大奖赛上亮相。
The German Grand Prix will see the introduction of the team's next package of aerodynamic, engine and mechanical improvements.
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