我正在使用AVSpeechSynthesizer进行TTS，但它会重复奇怪的文本，如“homograf”和“encore”。“ActualValue 3261，Day 30，Month July，Year 1990，Age 32，星星Sign Leo，Birthday 30 July 1990，Days since birth 11974，Days until birthday 79，Born on which day Monday，Birthday this year Sunday”
下面是我使用的文本到语音的代码

var synth = AVSpeechSynthesizer()
synth.delegate = self
try? AVAudioSession.sharedInstance().setCategory(.playback, mode: .default, options: [])
try? AVAudioSession.sharedInstance().setActive(true, options: .notifyOthersOnDeactivation)

func playAudio(word: String){
    let myUtterance = AVSpeechUtterance(string: word)
    myUtterance.voice = AVSpeechSynthesisVoice(language: "de-DE")
    if myUtterance.voice != nil {
        myUtterance.rate = Float(ttsConfig.speed)/10.0
        myUtterance.preUtteranceDelay = 0.5
        if isPauseAudio {
            synth.pauseSpeaking(at: .immediate)
        } else {
            synth.continueSpeaking()
            print("SPEAK EVENT----> \(word)")
            synth.speak(myUtterance)
        }
    }
}