The tests used in standards for evaluating smoke alarms were developed back in the 1980s. However, despite changes in building materials since then, smoke alarms remain reliable, says Chagger: "They still respond to all the main fires we get today."
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即将倒闭的大富豪夜总会门前，印度阿差哥脸上写满愁容（图：南方人物周刊记者 方迎忠）