今天我们要学的词是sign up。 To sign up, 是报名的意思。 "I signed up for the book club," 我报名参加这个读书俱乐部。 "The deadline to sign up is this Sunday," 报名的最后期限是这个星期天。 "More than 5,000 people have signed up for the charity marathon on Sunday," 五千多人报名参加星期天为慈善捐款举办的马拉松。 "Gordon Brown and two other British political party leaders have signed up for debates on Facebook and Youtube," 布朗和另外两位英国政治领袖同意参加在Facebook和Youtube网站上举行的辩论。好的，今天我们学习的词是sign up...