... unit surface area单位表面积 unit volume sample单位体积试样 unity单一（数）、个体、整数、单元、元素、统一（一致、不变）性、同质、均一 ...
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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。
Gas transmission rate: the volume of gas which, under steady conditions, crosses unit area of the sample in unit time under unit pressure difference and at constant temperature.
译文：气体透过系数（P）：单位时间内单位压力差下稳定透过单位面积上单位厚度的试样的气体体积。
Permeance (P): The ratio of the gas transmission rate to the difference in partial pressure of the gas on the two sides of the film.
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。
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.
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