Dual Gradient Drilling (DGD) is also known as Dual Density Drilling, which is a new type of drilling technology for deepwater drilling.是什么意思_Dual Gradient Drilling (DGD) is also known as Dual Density Drilling, which is a new type of drilling technology for deepwater drilling.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句