a formal agreement between two or more countries （国家之间的）条约，协定
the Treaty of Rome
《罗马条约》
a peace treaty
和平协定
to draw up/sign/ratify a treaty
起草／签署／正式批准条约
Under the terms of the treaty, La Rochelle was ceded to the English.
根据这个条约的条款，拉罗谢尔割让给了英国人。