The flattening is done by crushing tubes between two parallel surfaces.

使用两个平行面的压扁机将管材压扁。

youdao

Gas Transmission Rate (GTR) : the quantity of a given gas passing through a unit of the parallel surfaces of a plastic film in unit time under the conditions of test.

译文：气体透过率(GTR)：在试验环境下，在单位时间内、单位面积上透过塑料薄膜两平行平面的特定气体总量。

youdao

Gas Transmission Rate (GTR) : the quantity of a given gas passing through a unit of the parallel surfaces of a plastic film in unit time under the conditions of test.

译文：气体透过率：在一定的温度下，在单位时间内单位压力差下，稳定透过单位面积试样的气体体积。

youdao

Thus there are few broken lines to parallel the cratered surfaces and broken-off noses and limbs of the sculpture, not even lines or tones showing the teeth or grain of paper.

FORBES: Seeking The Perfect Summer Art Cocktail

The ionic layers are also very close indeed to the surfaces of the electrodes, and obviously run parallel with them whatever their shape.

ECONOMIST: Electricity storage

This works best when the electrodes are parallel with each other, which means they need to have smooth surfaces.

ECONOMIST: Electricity storage