掩体——掩体越重，挡在你和反射性沉降颗粒之间的物质——如厚墙壁，砖块，书本，土层越多，保护效果越好。
Shielding - the heavier and denser the materials - thick walls, concrete, bricks, books and earth - between you and the fallout particles, the better.
看见那些墙壁有多厚了吧？
这所房子有四件卧室，一个花园，可以观看海景和一个面积为8千多米的地下洞穴，四周水泥墙壁厚达80多厘米(见上图)。
The house has four bedrooms, a big garden, sea views and a 300-square-feet cavern with 32-inch thick concrete walls.
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