But the most reliable alternative to X - ray scanning, hand - searching everything, is slow and expensive.

但是手动搜索一切, 这种替代 X 射线扫描的最可靠的办法慢而昂贵.

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X - ray scanning stations for passengers'hand luggage are now at all metro stations in Shanghai.

检查乘客手提行李的 X 光扫描仪已经入驻上海所有地铁站.

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