来自TI，几个热阻参数的说明，概述如下：
Manythermalmetricsexistforintegratedcircuit(IC)packagesrangingfromθjatoΨjt.
Often,thesethermalmetricsaremisappliedbycustomerswhotrytousethemto
estimatejunctiontemperaturesintheirsystems.Thisdocumentdescribestraditional
andnewthermalmetricsandputstheirapplicationinperspectivewithrespectto
system-leveljunctiontemperatureestimation.
可不可以有个中文简介啊