private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.translate.v3beta1.Glossary.LanguageCodePair,
            com.google.cloud.translate.v3beta1.Glossary.LanguageCodePair.Builder,
            com.google.cloud.translate.v3beta1.Glossary.LanguageCodePairOrBuilder>
        getLanguagePairFieldBuilder() {
      if (languagePairBuilder_ == null) {
        if (!(languagesCase_ == 3)) {
          languages_ =
              com.google.cloud.translate.v3beta1.Glossary.LanguageCodePair.getDefaultInstance();
        }
        languagePairBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.translate.v3beta1.Glossary.LanguageCodePair,
                com.google.cloud.translate.v3beta1.Glossary.LanguageCodePair.Builder,
                com.google.cloud.translate.v3beta1.Glossary.LanguageCodePairOrBuilder>(
                (com.google.cloud.translate.v3beta1.Glossary.LanguageCodePair) languages_,
                getParentForChildren(),
                isClean());
        languages_ = null;
      }
      languagesCase_ = 3;
      onChanged();
      return languagePairBuilder_;
    }
<pre>
Used with unidirectional glossaries.
</pre>

<code>.google.cloud.translation.v3beta1.Glossary.LanguageCodePair language_pair = 3;</code>
java-translate/proto-google-cloud-translate-v3beta1/src/main/java/com/google/cloud/translate/v3beta1/Glossary.java