Remember that hearing a siren or tone alert radio does not mean you should evacuate.
记住，听到警报或人声广播并不意味着你需要撤离。
Another pilot on the ground at the heliport saw the plane approaching and tried to radio an alert to the helicopter above. But the warning was either not heard, or failed to get through in time.
另一名驾驶员在机场地面看到小型飞机向直升机飞近，他设法用无线电紧急警告上空的直升机驾驶员，但他可能没有听到，或听到时为时已晚。
When the sirens are sounded, you should listen to your radio, television and tone alert radios for site-specific information and instructions.
当警报响起时，应收听电台电视和人声广播中的信息和应急指南。
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