《资治通鉴·汉纪·汉纪二》
汉王派人悄悄地探听那挑战者是谁，才知道竟是项羽本人，汉王为此大吃一惊。
汉王使人间问之，乃项王也，汉王大惊。
The Han Wang sent people to secretly investigate who the challenger was and found out unexpectedly that it was Xiang Yu himself, which greatly surprised the Han Wang.