They power a blade in the water that the pilot can adjust to reduce drag.
他们在水中为一个划片供能，因此驾驶者可以调整以降低拖力。
To combat this, 'change a blade at the first sign that it starts to drag against the skin, ' said Dr Bunting.
为了防止此类现象，邦廷博士说“第一次出现开始划皮肤的迹象时就应该换刀片。”
Increasing the lift drag ratio of turbine blade is an effective way for improving turbines aerodynamic characteristics.
提高叶轮机械叶片的升阻比，是改进叶轮机械气动性能的重要途径。
Based on the theoretical analysis, a new type of blade bit was invented. And this kind of bit combines the advantages of PDC bits and drag bits. And a series of field experiments were performed.
在理论分析的基础上，综合PD C钻头和刮刀钻头的优点，设计了一种新型的刮刀钻头，并进行了现场试验。
Based on the theoretical analysis, a new type of blade bit was invented. And this kind of bit combines the advantages of PDC bits and drag bits. And a series of field experiments were performed.
在理论分析的基础上，综合PD C钻头和刮刀钻头的优点，设计了一种新型的刮刀钻头，并进行了现场试验。
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