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1. The ringdown signalling indicated that the satellite was approaching the earth's surface.
信号下降表明卫星正在接近地球表面。
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2. The power supply has been ringdown signalling for several hours now.
电力供应已经持续了数小时的环状信号。
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3. The ringdown signalling is causing some confusion among the passengers.
信号衰减给乘客带来了一些混乱。