Thus, if a sentence also mentions another entity, it implicitly expresses their relation.
we make a similar assumption as in relation extraction: If two entities participate in a relation, and both of them < e en,Kobe , e zh,Kobe > < e en,Joe , e zh,Joe > ing (Tsai and Roth, 2016;Yamada et al., et al., 2017;Ji et al., 2016).