On the other hand, NPTF threads are designed to ensure that sufficient crushing of the entire thread form will take place to produce a mechanical seal.

另一方面，NPTF螺纹的设计用于保证在整个牙形上产生足够的变形以生成这种机械密封。

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Clay content of gas reservoir is high, the clay takes on the scaly, silk-thread form, bridging the pore and clogging or plugging the pore structure and throat.

储层内粘土矿物含量较高，伊利石呈片状、丝缕状桥接孔隙，造成对孔隙、喉道的堵塞或封隔，使孔隙的连通性进一步降低。

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Various NC programs to machine sphericity thread form based on ellipse contour are developed using macro programs. This method can be used for the contour machining of all types of conic.

举例编制了椭圆轮廓上球形螺纹的宏加工程序，此方法适用于所有二次曲线的球形螺纹加工。

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Incoming messages pop up on the top right in the form of what Facebook calls chat heads, which are bubbles that each represent a particular conversation thread and is displayed via a pop-over dialog box.

ENGADGET: Facebook Home hands-on (video)