private com.google.protobuf.SingleFieldBuilderV3<
              com.google.cloud.translate.v3.GlossaryTerm,
              com.google.cloud.translate.v3.GlossaryTerm.Builder,
              com.google.cloud.translate.v3.GlossaryTermOrBuilder>
          getSourceTermFieldBuilder() {
        if (sourceTermBuilder_ == null) {
          sourceTermBuilder_ =
              new com.google.protobuf.SingleFieldBuilderV3<
                  com.google.cloud.translate.v3.GlossaryTerm,
                  com.google.cloud.translate.v3.GlossaryTerm.Builder,
                  com.google.cloud.translate.v3.GlossaryTermOrBuilder>(
                  getSourceTerm(), getParentForChildren(), isClean());
          sourceTerm_ = null;
        }
        return sourceTermBuilder_;
      }
<pre>
The source term is the term that will get match in the text,
</pre>

<code>.google.cloud.translation.v3.GlossaryTerm source_term = 1;</code>
java-translate/proto-google-cloud-translate-v3/src/main/java/com/google/cloud/translate/v3/GlossaryEntry.java