A balanced plug of cement slurry placed in the wellbore.
置于井筒中的水泥浆的平衡塞。
The volcanic plug might be black Plasticine, the castle balanced solidly atop it a skewed rendition of crenellated building bricks.
火山栓就像黑色橡皮泥一样使砖结构的城堡稳稳的耸立于天地之间。
The volcanic plug might be black Plasticine, the castle balanced solidly atop it a skewed rendition of crenellated building bricks.
火山栓就像黑色橡皮泥一样使砖结构的城堡稳稳的耸立于天地之间。
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