X-rays enter the box through a small hole that in turn focuses them, like an old-fashioned pinhole camera.

射线通过一个小孔进入盒子，从而集中成一束。就像以前的针孔照相机。

youdao

X-rays enter the box through a small hole that in turn focuses them, like an old-fashioned pinhole camera.

射线通过一个小孔进入盒子，从而集中成一束。就像以前的针孔照相机。

youdao