Projecting horizontal beam fixed at one end only.
只装在一头的凸出的水平木版。
A projecting structure, such as a beam, that is supported at only one end.
悬臂仅在一端被支撑的一个突出结构，如一段横梁
The pickup head comprises a sled and a lens for projecting a beam on a disk.
光头包含滑橇与用于投射光束至磁盘的透镜
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