| 摘要 |
The speculum has two hinged arms (1,2) forming a pair of jaws (10,20) on one side of the hinge and a pair of handles (11,21) on the other. One of the handles supports one end of an elongated square locking bar (3), while the other end projects through an aperture (14) in the other handle. The aperture has a fat portion (16) allowing free passage of the bar through it and a thin portion (15) which grips the bar.
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