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Drilling is a survey method that uses a shovel to collect soil samples and observe underground remains. Its advantage is that it can directly go deep underground for sampling and observation, intuitively and accurately obtain cultural accumulation data of a certain location. It is labor-saving and less destructive than excavation, and can understand a large area of underground conditions in a short period of time. Suitable for specific understanding of the distribution range, thickness, large building sites, large tombs, and the shape and layout of ancient cities.
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