STEM与日常科技·英语30篇（9）
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What Makes Airport Security Scanners Show Color-Coded Threat Alerts
机场安检扫描仪如何显示彩色威胁提示
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Airport scanners highlight metal items in blue and organic materials in orange.机场扫描仪将金属物品标为蓝色，有机物标为橙色。
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Each color helps screeners quickly decide whether to inspect further.每种颜色帮助安检员快速判断是否需要进一步检查。
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Liquids appear as translucent amber shapes inside your carry-on bag.液体在随身行李中呈现为半透明琥珀色形状。
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The software compares item density and shape against a safety database.软件将物品的密度和形状与安全数据库比对。
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If something looks unusual, the screen flashes yellow for closer review.若发现异常，屏幕会闪黄色提示需重点复查。
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Passengers never see the full image — only authorized staff do.旅客无法看到完整图像，仅授权工作人员可见。
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Newer scanners use millimeter waves instead of X-rays for safer scanning.新型扫描仪采用毫米波而非X射线，更安全。
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You’ll hear a quiet tone when your bag clears without alerts.行李无警报通过时，你会听到一声轻柔提示音。
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Scanners update their threat library automatically overnight via secure Wi-Fi.扫描仪每晚通过安全Wi-Fi自动更新威胁库。
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The color system works the same way whether you’re traveling alone or with kids.无论独自出行还是带孩子，该色彩系统均一致运作。