如何让Android语音助手将连字符读成" to "？

import android.speech.tts.TextToSpeech;
import android.speech.tts.TextToSpeech.OnInitListener;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import java.util.Locale;

public class MainActivity extends AppCompatActivity implements OnInitListener {
    private TextToSpeech textToSpeech;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        textToSpeech = new TextToSpeech(this, this);
    }

    @Override
    public void onInit(int status) {
        if (status == TextToSpeech.SUCCESS) {
            // 设置语言为英语
            int result = textToSpeech.setLanguage(Locale.US);

            if (result == TextToSpeech.LANG_MISSING_DATA || result == TextToSpeech.LANG_NOT_SUPPORTED) {
                // 语言数据丢失或不支持，无法进行语音转换
                // 可以在这里进行错误处理
            } else {
                // 连字符替换为" to "
                String text = "Hello-world";
                text = text.replace("-", " to ");

                // 将文本转换为语音
                textToSpeech.speak(text, TextToSpeech.QUEUE_FLUSH, null);
            }
        } else {
            // 初始化失败，无法进行语音转换
            // 可以在这里进行错误处理
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();

        // 释放TextToSpeech对象资源
        if (textToSpeech != null) {
            textToSpeech.stop();
            textToSpeech.shutdown();
        }
    }
}