《纺织染专业英语》REVIEWpart1Intextilelaboratories,standardconditionsof65percentR.H.(relativehumidity)and20℃aremaintainedsothatthesamplesbeingtestedacquirethenormalamountofmoisture.“Regain”istheamountofwaterormoistureintextilesbasedontheirdryweight.（重点）If10.0gramsofmaterial,forexample,isdriedthoroughlyandthenfoundtoweight9.0grams,theregainis:1×100%/9equals11.1%.我国常见纤维的公定回潮率纤维种类及公定回潮率（％）TwistinyarnThethreeessentialsinthespinningofyarnaredrawing,twistingandwinding.Itisthetwistinyarnthatactuallyholdsthefiberstogetheranddeterminesthestrength.“Ayarnmaybehigh,medium,orlowintwist.Theamountoftwistnecessaryisdeterminedbytheenduseoftheyarninacloth.Bothsingleandplyyarnaregiventwist.“Twistisdefinedasthenumberofturnsaboutitsaxisperunitoflength,notedinafiber,yarnorcord.Itisexpressedinturnsperinch,orturnspermeter.（重点，难点）Thetwistcounterisaninstrumentthatdeterminesthenumberofturnsoftwistperinchinalltypesofyarns.Itisalsousedtofindtheamountoftake-upinyarnsduetotwist.CountandlineardensityThe“count”ofayarnisanumericalexpressionwhichdefinesitsfineness.Therearetwomethodsofmeasurement:Part2Part2Part2Part2Part2Part3Part3Part3Measurementofthispropertyprovidesnotonlyanindicationofquality,butalsomakesitpossibletolocatefaultsinprocessingandtoadjustmachinesettingsaccordinglyortomakeotherneededcorrections.TheUsteristheoneofthemostwidelyusedinstrumentsfortestingyarnunevenness.Itisprovidedwithautographicrecordersandintegratingattachmentsandgivesthecoefficientofvariationdirectly.总结作业：英译汉NEXTLESSON