协议标志着中美长达13年痛苦谈判的终结。

(1)We are not trying to practice medicine. We are trying to give consumers detailed information on their various health care issues.
(2)American and Japanese researchers have discovered a strong connection between weather and conditions in the ocean.
(3)Boeing, the world’s largest commercial airplane maker, announced it has 18 billion dollars in new orders this year for its new 777 jetliner.
(4)The agreement marks the end of thirteen long and often painful years of negotiations between China and the United States.
(5)Tourism clearly counts as one of the most remarkable economic and social phenomena of the last century. It undoubtedly will keep this position for the century to come.