Task: Question Understanding
Input (English): As in the work of E. Tong et al. ( BIBREF9 ), we pre-train word embeddings using a skip-gram model BIBREF4 applied to unlabeled data from escort ads, however, we go further by analyzing the emojis' embeddings and thereby expand the trafficking lexicon. 
 Question: Do they use pretrained word embeddings?
Output (English): Yes-no