public Builder addReferenceSentencePairs(
          int index,
          com.google.cloud.translate.v3.AdaptiveMtTranslateRequest.ReferenceSentencePair value) {
        if (referenceSentencePairsBuilder_ == null) {
          if (value == null) {
            throw new NullPointerException();
          }
          ensureReferenceSentencePairsIsMutable();
          referenceSentencePairs_.add(index, value);
          onChanged();
        } else {
          referenceSentencePairsBuilder_.addMessage(index, value);
        }
        return this;
      }
<pre>
Reference sentence pairs.
</pre>

<code>
repeated .google.cloud.translation.v3.AdaptiveMtTranslateRequest.ReferenceSentencePair reference_sentence_pairs = 1;
</code>
java-translate/proto-google-cloud-translate-v3/src/main/java/com/google/cloud/translate/v3/AdaptiveMtTranslateRequest.java