... precaution system 预警系统 Precautionary landing 预防性紧急着陆 precession 进动;岁差 ...
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precautionary landing pattern 预防性着陆航线
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Request precautionary landing at Beijing due to engine failure.
请求在北京降落，因发动机故障。
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She couldn't say whether the aircraft had made a precautionary landing or whether the Taliban had forced it down.
WSJ: Taliban Capture 9 From Helicopter in Afghanistan
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