When using your phone for prolonged periods of time, such as when you're talking to the phone, charging the battery, browsing the web or using navigating software, the device may become warm.
2
这些研究人员接着证实说,使用手机长达 13 年或者更长时间与没有注册的用户没有区别。
They then go on to defend their methods by saying there was no difference between subscription holders of 13 years or more and non-subscription holders.