每年的农历九月初九是中国的传统节日重阳节，重阳节的起源最早可以追溯到战国时期。
翻译是：The 9th day of the ninth month of the Chinese lunar calendar is the annual Chinese traditional festival Chung Yeung Festival. The origin of the festival can be traced back to the Warring States Period.
句子解释：
traditional 英[tr?dnl] 美[tr?dn?l]
adj. 传统的; 口传的; 惯例的; 因袭的;
[例句]We're still a traditional school in a lot of ways.
我们在很多方面仍是一所旧式学校。
origin 英[?r?d?n] 美[?:r?d?n]
n. 出身; 起源，根源; [数] 原点，起点; [解] （筋，神经的） 起端;
[例句]The disorder in military policy had its origins in Truman's first term.
军事政策的混乱可追溯到杜鲁门的第一届任期。
trace back to 英[treis b?k tu:] 美[tres b?k tu]
[词典] 追溯到…;
[例句]This tradition can trace back to the early period of British North American colony.
美国有着悠久的免费分配土地的传统，这一传统可以追溯到英属北美殖民地建立的初期。