Some objects do not allow light to go through them. 有些物体是不透光的。
The ability to gather oxygen with its arm webbing enables it to live in the oxygen minimum layer of the ocean, where there is virtually no light penetration. 其触手间的薄翼可以吸取水中的氧元素,这种能力使其能够在海洋里暗不透光的低含氧层中生存。
This kind of hat must be insensitive to light and heat. 这种帽子必须不透光不传热。
If light could be kept out from where you are so that there could be no light for the book to reflect,then you couldn't see the book even with your eyes wide open. 如果你所在的地方不透光,那么就没有供书反射的光,因此你即使睁大眼睛也看不见它。