写出下列句子的意思。
20世纪90年代，美国与加拿大、墨西哥努力通过自由贸易实现发达国家与发展中国家优势互补，增强区域集团的实力。（ ）
Mike is a boy. He is seven years old. His birthday is September 9. He is 1.4 metres tall. He lives in a house near the park. His address is 36 Park Road. He likes to read books on Sundays.
的直线与直线
平行，则实数
的值为