立管内部核心是空心的(管中管)，留给钻柱使用。
The riser's inner hollow core (a pipe within a pipe) is reserved for the drill string.
玻璃彩筒、钻类、立金线条在灯光的照射下闪闪反光，使其鲜艳夺目，豪华美观。
The glass colored cylinder, the diamonds and the standing golden lines reflect under the illumination of the lamplight, to cause the utility model to be brilliant, dazzling, luxurious and artistic.
玻璃彩筒、钻类、立金线条在灯光的照射下闪闪反光，使其鲜艳夺目，豪华美观。
The glass colored cylinder, the diamonds and the standing golden lines reflect under the illumination of the lamplight, to cause the utility model to be brilliant, dazzling, luxurious and artistic.
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