... overhead 经常开支 Overhead-valve engine 顶置气门发动机 overhear 多指在别人不注意或不知道的情况下偶然听到谈话的内容。 ...
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N a type of internal-combustion engine in which the inlet and exhaust valves are in the cylinder head above the pistons 顶置气门发动机 (US name valve-in-head engine) → compare side-valve engine
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