OPPO NMT System for IWSLT 2019 Xiaopu Li author Zhengshan Xue author Jie Hao author 2019-nov 2-3 text Proceedings of the 16th International Conference on Spoken Language Translation Jan Niehues editor Rolando Cattoni editor Sebastian Stüker editor Matteo Negri editor Marco Turchi editor Thanh-Le Ha editor Elizabeth Salesky editor Ramon Sanabria editor Loic Barrault editor Lucia Specia editor Marcello Federico editor Association for Computational Linguistics Hong Kong conference publication li-etal-2019-oppo https://aclanthology.org/2019.iwslt-1.2/ 2019-nov 2-3