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1. The satellite's altitude signal was lost in the storm.
卫星的海拔信号在风暴中丢失了。
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2. The astronauts were monitoring the altitude signal to ensure their safety.
宇航员正在监控海拔信号以确保他们的安全。
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3. The aircraft's altitude signal indicated that it was flying at a high altitude.
飞机的海拔信号显示它正在高空飞行。