The third element is to find supporting written materials. This may be more difficult overseas, "but this is the final step, because the materials aren't necessarily accurate, and sometimes you might search the libraries for a month and not find anything."
第三是文獻材料的輔助，這一點國外的條件可能差一點，「然而這也是最末一端，因為不見得都對，而且有時候去圖書館翻書一個月也沒有找到什麼資料。」