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。
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。
The protective earth dike shall be earth-filled. no rock brick and concrete block or light and flammable material shall be allowed for filling.
防护土堤应用土填筑，不允许使用石块、砖块及混凝土块或者轻而可燃的材料填筑。
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