他的声音逐渐减弱，我们听不到其余部分。

His voice ___trailed ___off weakly, and we couldn't hear the rest.

弗雷德的声音逐渐减弱，因为他感到腿软。

Fred's voice ___trailed ___off as he felt his legs give way.

表演者离开后，掌声逐渐减弱。

The applause ___trailed ___off after the performer left the stage.