translation.en: So one of the principle applications for this material is, amongst other things, in baby bottles, so it indicates when the contents are cool enough to drink.
translation.zh: 除了其它用途， 这种材料主要应用于婴儿奶瓶的制造。 当瓶内饮料凉到适和饮用的温度时人们就会看得到