通常来说，效率最高的箱体是两种窄带宽的带通箱设计，其中双反射版本会有小小的优势。
Generally speaking, the most efficient enclosures are the two narrow-bandwidth bandpass designs with the dual-reflex version having a slight edge.
标准版本采用腈双密封唇和标准油脂。
Standard versions feature a nitrile double-lip seal and standard grease.
“真正的”3d电影是用双镜头摄像机拍摄的，每一帧都会有两个不同版本。
"Real" 3d movies are shot with a dual-lens cameras, which capture two versions of every shot.
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