这些设备通常都使用透镜镜头，将不同的图像向两个固定的方向投影。
These devices usually use lenticular lenses to project different images in two fixed directions.
得益于它们的重量，MACS星系就像一个巨大的宇宙镜头，能放大，变形和弯曲经过它们的任何光，和引力透镜的效果一样。
Because of their heft, the clusters act like giant cosmic lenses, magnifying, distorting and bending any light that passes through them - an effect known as gravitational lensing.
当阳光穿过墙上的一个透镜头时，达·芬奇的三维头像就会被投射在织物上面，制成一个永久性的头像面容。
When the sun's rays passed through a lens in one of the walls, Leonardo's 3D model would have been projected on to the material, creating a permanent image.
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