Evaluate the collective function of references cited together in a given text segment.
Classify their combined role into one of the following categories: 'method', 'background', or 'result'.

Text:As training data, we use the IWSLT07 Chinese– English data set (Fordyce, 2007), which contains
46,867 sentence pairs of training data, and 489 Chinese sentences with 6 English reference translations each as test data; all the sentences are taken from the traveling domain.
Category: