It is shown that the existence of central screw conveyer produces the contrary swirl flow under some of the swirl vane Angle condition.

研究表明：由于进料螺旋输送器的作用，在一定的导流叶片角条件下存在着双旋流流场。

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Loose soleplate screw of the roller shelf, and adjust the central height of the two rollers by increasing or decreasing cushion, then tighten the screw.

松开罗架的底板螺丝，用增垫和去垫的方法调整两罗拉的中心高度，然后再拧紧螺丝。

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After the fixing bolt is completely screwed in the central hole of the screw, the upper end-face of the fixing bolt is lower than the upper end-face of the fixing sleeve pipe.

固定螺钉完全旋入螺杆中心孔后，固定螺钉的上端面低于固定套管的上端面。

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For centuries now the screw has held things together, and for almost as long it has been frustratingly inept at its central purpose.

FORBES: Magazine Article