Hockey players recount Rhode Island ice rink shooting
"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.
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那麼，在這麼多選擇中，究竟哪種才是最有效、具有科學根據的語言學習方式呢？