Stereo cameras eventually went out of style but you might recognize this more modern version of a stereoscope.

立体相机最终过时了，但您可能会认出这种更现代的立体镜。

The two lenses in the stereoscope transformed the two pictures into a single scene with the effect of a third dimension.

立体镜中的两个镜头将两张图片转换为具有三维效果的单个场景。

Other early precedents for today's smorgasbord of borrowable objects include framed paintings (1904 in Newark, New Jersey), piano rolls (1907 in Evanston, Illinois), and stereoscopes (1909 in Portland, Oregon).

其他早期的可借阅物品先例还包括裱好的油画(1904年，产自新泽西州的纽瓦克)、钢琴卷(1907年，产自伊利诺伊州的埃文斯顿)和立体镜(1909年，产自俄勒冈州的波特兰市)。

If you are forty years old, you may remember those old-fashioned stereoscopes that we used to hold up before our eyes to look at two pictures exactly alike.

如果你四十岁了， 你可能还记得我们过去常常举在眼前看两幅完全一样的照片的老式立体镜。