The protective bit at the front of the eye is the cornea and once light passes through this membrane, it passes through the iris.
在眼睛最外层起保护作用的薄膜是角膜。光线通过这层薄膜后，就进入了虹膜。
2
Viewing the Sun's harsh light should only be done through protective equipment - proper solar glasses and solar telescopes, or through a pinhole projection system.
直视骄阳是危险的，只能通过适合的日食镜、配有滤光片的望远镜或者针孔投影系统观看日食。
3
The protective earth dike shall be earth-filled. no rock brick and concrete block or light and flammable material shall be allowed for filling.