private com.google.protobuf.RepeatedFieldBuilderV3<
            com.google.cloud.texttospeech.v1.MultiSpeakerMarkup.Turn,
            com.google.cloud.texttospeech.v1.MultiSpeakerMarkup.Turn.Builder,
            com.google.cloud.texttospeech.v1.MultiSpeakerMarkup.TurnOrBuilder>
        getTurnsFieldBuilder() {
      if (turnsBuilder_ == null) {
        turnsBuilder_ =
            new com.google.protobuf.RepeatedFieldBuilderV3<
                com.google.cloud.texttospeech.v1.MultiSpeakerMarkup.Turn,
                com.google.cloud.texttospeech.v1.MultiSpeakerMarkup.Turn.Builder,
                com.google.cloud.texttospeech.v1.MultiSpeakerMarkup.TurnOrBuilder>(
                turns_, ((bitField0_ & 0x00000001) != 0), getParentForChildren(), isClean());
        turns_ = null;
      }
      return turnsBuilder_;
    }
<pre>
Required. Speaker turns.
</pre>

<code>
repeated .google.cloud.texttospeech.v1.MultiSpeakerMarkup.Turn turns = 1 [(.google.api.field_behavior) = REQUIRED];
</code>
java-texttospeech/proto-google-cloud-texttospeech-v1/src/main/java/com/google/cloud/texttospeech/v1/MultiSpeakerMarkup.java