public Builder clearPhrase() {
      phrase_ = getDefaultInstance().getPhrase();
      bitField0_ = (bitField0_ & ~0x00000001);
      onChanged();
      return this;
    }
<pre>
The phrase to which the customization will be applied.
The phrase can be multiple words (in the case of proper nouns etc), but
should not span to a whole sentence.
</pre>

<code>optional string phrase = 1;</code>

@return This builder for chaining.
java-texttospeech/proto-google-cloud-texttospeech-v1beta1/src/main/java/com/google/cloud/texttospeech/v1beta1/CustomPronunciationParams.java