Upward motion of the buoy causes a suction which lifts the balls, thus allowing air to be drawn back down the counterweight tube.

浮标的向上运动则产生吸力，可将阀球提起，这样可允许气流受力并返回至配重管。

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Seamless copper tube is pressed and drawn.

铜管是压制的和拉制的无缝管。

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The extrusion process is a traditional method for the TP2 copper tubes, in which continuous casting solid billet is extruded to hollow tube billet firstly and then drawn to tube.

传统的TP2铜管生产方法——挤压法是由连铸实心铸坯挤压成管坯，再经过拉拔加工成管材。

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The heating and cooling systems use air that has been earth-tempered drawn into a large tube and passed through the ground, which has a consistent temperature that is cool in the summer and warm in the winter.

BBC: The futurist: The sustainable Spaceport America

The Alabama state legislature has drawn up the Starvation and Dehydration Prevention Act, which prevents the removal of a feeding tube without written instructions from the patient.

BBC: A younger Terri Schiavo