it was the memory / memories of 追溯到… (回憶類經(jīng)典句)

　　Perhaps it was the memories of the 1964 Tokyo Olympics and the 1988 Seoul Olympics, which were considered turning points in their nations' development.

　　追溯到1964年東京及1988年漢城舉辦的奧運會，可能分別被視為日韓兩國發(fā)展的轉(zhuǎn)折點。

　　It was the memory of 1945 Hiroshima and Nagasaki suffered from the attacks of atomic bomb, from which originated the term of "Zero Ground".

　　追溯到1945年廣島和長崎遭受原子彈攻擊，從而形成了“零地帶”這個術(shù)語。