Signal has long been associated with its end-to-end encryption, becoming a communication method of choice for activists, journalists, and those worried about privacy. Signal says its services "do not provide access to emergency service providers like the police, fire department, hospitals, or other public safety organizations," though the FBI has found ways to spy on users.
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电动三轮车撑起了县城的交通（图：南方人物周刊记者 刘璐明）
'transferControlToOffscreen',
（一）合同在受胁迫或者危险情况的影响下订立，并且合同条款显失公平；