He said they also seemed to think their fingers were shorter than their true lengths.
他还说，大家似乎还认为自己的手指比实际长度短。
True length
原声例句
精选英语短文
传说之境
In other words, meaning the shorter the segments used to measure, the longer the measurement of the curved line becomes and the closer you get to the curved line's true length.
换句话说，用来测量的线段越短，曲线的测量就变得越长，也就越接近曲线的真实长度。
英语百科
True length
In geometry, true length is any distance between points that is not foreshortened by the view type. In a three-dimensional Euclidean space, lines with true length are parallel to the projection plane. For example, in a top view of a pyramid, which is an orthographic projection, the base edges (which are parallel to the projection plane) have true length, whereas the remaining edges in this view are not true lengths. The same is true with an orthographic side view of a pyramid. If any face of a pyramid was parallel to the projection plane (for a particular view), all edges would demonstrate true length.
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