他查出了引起发动机发出爆震声故障的原因。
听是否有空气泄漏声，油泵嗡嗡声(油泵有声音并不意味着工作不良)，发动机卡嗒卡嗒声或爆震声。
Listen for any audible air leaks, unusual noises, fuel pump buzz (a noisy pump may not be an indication of poor operating condition), engine rattles or knocks. E.
这是一次完全剔除爆震因素的急性声创伤实验研究。
This is an experimental research into acute acoustic trauma free entirely from any explosive factor.
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