在两国关系史上掀开了新的一页的英文

open a new chapter in the annals of relations between the two countries

• 在:    exist; be living
• 关系:    relation; filiatio ...
• 史:    history
• 上:    upper; up; upward
• 了:    finish; complete; ...
• 新:    new; fresh; novel; ...
• 的:    4次方是 The fourth po ...
• 一页:    one page