before_sent:  Preliminary experiments have shown the approach to continuously outperform the tagging approach on low resource English-Vietnamese neural machine translation .
before_sent_with_intent: <clarity>  Preliminary experiments have shown the approach to continuously outperform the tagging approach on low resource English-Vietnamese neural machine translation .
after_sent:  Preliminary experiments have shown the approach to continuously outperform the tagging approach on low resource English-Vietnamese NMT .