public java.util.List<
              com.google.cloud.translate.v3.AdaptiveMtTranslateRequest.ReferenceSentencePairList>
          getReferenceSentencePairListsList() {
        if (referenceSentencePairListsBuilder_ == null) {
          return java.util.Collections.unmodifiableList(referenceSentencePairLists_);
        } else {
          return referenceSentencePairListsBuilder_.getMessageList();
        }
      }
<pre>
Reference sentences pair lists. Each list will be used as the references
to translate the sentence under "content" field at the corresponding
index. Length of the list is required to be equal to the length of
"content" field.
</pre>

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