热穿透指的是热量扩散的一种衡量方式，常用特征尺度热穿透深度来表示。热穿透深度告诉我们声波振荡在π分之一个周期的时间内热量能够扩散多远。温度越高，需时越短，热穿透能力越强。
文中的第二部分对湿热灭菌中的热量和质量传递进行了研究，目的是通过理论计算确定湿热灭菌过程中的热穿透时间。
The second part was about heat mass transfer models in moist sterilization process, from which the heat transport time could be theoretically calculated.
夏天的街道又热又满是灰尘，太阳是那么明亮，它甚至穿透了焦化镇上空的阴霾，使人们不能稳定地看到它。
The streets were hot and dusty on the summer day, and the sun was so bright that it even shone through the haze over Coketown, and could not be looked at steadily.
热也使我们的环境变得适宜生存，而且一些紫外线会穿透大气层。
Heat, too, makes our environments tolerable and some ultraviolet rays penetrate the atmosphere.
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