词典释义：
constituting number four in a sequence; 4th
第四
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the fourth and fifth centuries 第４和第５世纪
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there were three bedrooms, with potential for a fourth. 有三间卧室，还可扩出第四间。
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〈主美〉 四分之一
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nearly three fourths of that money is now gone. 那笔钱已花掉了近３／４。
the fourth finisher or position in a race or competition
（比赛或竞赛的）第四名；第四位
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he could do no better than finish fourth. 他只能跑到第四名。
the fourth (and often highest) in a sequence of a vehicle's gears
汽车第四挡（通常是最高挡）
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he took the corner at the end of the road in fourth. 他在路尽头用四挡转弯。
〈主英〉 四年级。
fourthly (used to introduce a fourth point or reason)
第四（用来引出第四个要点或原因）
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third, visit popular attractions during lunch; fourth, stay late. 第三，午饭时间参观热门景点；第四，在那里多逗留些时间。
【乐】 四度音程。
【乐】 四度音。
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the fourth estate the press; the profession of journalism 新闻界 -
［ORIGIN originally used humorously in various contexts; its first usage with reference to the press has been attributed to Edmund Burke but this remains uncon firmed．］
