Several new approaches to the deepwater dual gradient drilling were developed, including subsea mudlift drilling, riserless drilling, and dual density drilling.
双梯度钻井又称为双密度钻井，是一种适用于深水钻井的新型钻井技术。
Dual Gradient drilling (DGD) is also known as Dual Density drilling, which is a new type of drilling technology for deepwater drilling.
双梯度钻井又称为双密度钻井，是一种适用于深水钻井的新型钻井技术。
Footbed is equipped with anti-moisture fabric, dual-density foam and EVA comfort system.
鞋底装有防潮布，双密度泡沫和EVA舒适系统。
Footbed is equipped with anti-moisture fabric, dual-density foam and EVA comfort system.
鞋底装有防潮布，双密度泡沫和EVA舒适系统。
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