question: public boolean add ( String source , String target , String align ) { AlignedSentence s = getSentence ( source , target , align ) ; if ( s == null ) { logger . warn ( "Cannot add unaligned sentence to corpus: {} ||| {} ||| {}" , source , target , align ) ; return false ; } else { segments . add ( s ) ; return true ; } }
target:  Add an aligned sentence to the corpus.