 However, domain adaptation  between distant domains (e.g.,  subtitles and research papers) does not perform effectively because of mismatches in vocabulary;
<meaning-changed>  However, domain adaptation  between distant domains (e.g.,  subtitles and research papers) does not perform effectively because of mismatches in vocabulary;
 However, domain adaptation from resource-rich domains that are, in most cases, distant from the target domain. Domain adaptation between distant domains (e.g., subtitles and research papers) does not perform effectively because of mismatches in vocabulary;