如此大量的物质会完全阻挡阳光到达地表，使地球陷入至少持续数月的寒冷和黑暗之中。
Such a quantity of material would have blocked the sunlight completely from reaching the surface, plunging Earth into a period of cold and darkness that lasted at least several months.
黑色遮阳网，可完全阻挡阳光。
使用得当的防晒系数为8或更高的防晒霜在完全阻挡紫外线辐射的同时也阻止了维生素d的合成。
Used properly, sunscreens with an SPF of 8 or higher completely block UVB radiation and prevent synthesis of vitamin d.
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