"I just think it's kind of a dangerous precedent for social media companies to request 3D scans of your face or official documents without there being any kind of knowledge of how that information is being protected or stored," he tells the BBC.
2.6 ELU（Exponential Linear Unit）
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龙先生说，之所以写下这段遭遇，是因为许多家庭都面临着母亲和自己一样的问题——如何在数字时代，为老人构建起一张放心的安全网，这个过程比想象的要更难、更长。
Buying a camera for travel photography, sports photos or vlogging is a bit trickier. Here, you need to choose either a compact camera with a fixed lens or a mirrorless model that supports removable lenses.