Update introduction.tex

AAAI2021/tex/introduction.tex

@@ -64,7 +64,7 @@ Yet, few works investigate the emergence of high compositional symbolic language
 In other words, it is never clear whether \emph{natural}
 environment and agents are sufficient for achieving high compositionality. 
 
-In this paper, we are the first work to achieve high compositional
+This paper is the first one to achieve high compositional
 symbolic language without any deliberately handcrafted induction. The key observation
 is that the internal \emph{agent capacity} plays a crucial role in the
 compositionality of symbolic language.