布希柏格教授说，移除表层土壤可以保证土地的使用安全，但这取决于放射性物质渗入的深度。
Professor Bushberg says removing the topsoil might make the land safe for use. But it depends on the depth of the radioactive material.
蛇纹石是一种用来珠宝装饰的深绿色矿物，它形成于俯冲带，当海水渗入到地球上地幔的环境中，形成深度可达200km。
Serpentinite is a dark green mineral used in decoration and jewelry. In nature, it is formed when sea water infiltrates into Earth's upper mantle, at depths that can reach 200 km in subduction zones.
而正是从这些一般的行为规范上我们才更能看出佛教渗入中国文化的深度。
From all these, we can see the breadth and depth of the infiltration of Buddhism.
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