| 单词 | drill the core |
| 释义 | drill the core There are two types of rotary drilling, open hole drilling and core drilling. Retrieved from Wikipedia CC BY-SA 3.0 These are popularly used core drills on magnetic core drilling machines. Retrieved from Wikipedia CC BY-SA 3.0 Deep core drilling into hard ice, and perhaps underlying bedrock, involves using a hollow drill which actively cuts a cylindrical pathway downward around the core. Retrieved from Wikipedia CC BY-SA 3.0 Deep ice core drilling, meteorology and seismic studies were conducted. Retrieved from Wikipedia CC BY-SA 3.0 Core drilling in the delta has indicated 15 meters of mollusk-bearing sediment, over peat and sand deposits dating back over 6000 years. Retrieved from Wikipedia CC BY-SA 3.0 |
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