相反，中国的核力量更加有限，中美年贸易总额高达五千亿美元，每年有350,000多中国留学生和三百万游客赴美。
By contrast, China has a more limited nuclear force, annual Sino-American trade totals a half-trillion dollars, and more than 350,000 Chinese students and three million tourists are in the US each year.