Thereafter, westerners such as missionaries, merchants, travelers, diplomats and Jewish representatives in China have been studying the Jews in Kaifeng for more than 300 hundred years at intervals.

从此之后，西方的入华传教士、商人、旅行家、外交官和西方犹太人代表，陆续对开封犹太人进行了300多年的调查和研究。他们搜集到的资料，是现有的研究开封犹太人的第一手文献。

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