天然露头（natural outcrop）是指一些由于地质作用而暴露在地表面上，而可以让我们看到，或接触到的岩石。
使用人造岩心、天然露头砂岩岩心，天然油田砂岩岩心及模拟油进行了驱替实验。
The displacement experiments were made by using artificial core, natural outcrop sandstone core, natural sandstone core in oil field and simulated oil.
但是在过去十年中，第三代人工草皮凭借其像天然草皮一样的表现开始崭露头角。
But over the past decade, third-generation artificial turfs that perform every bit as well as natural grasses have begun to sprout.
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