第七的用法和样例：
例句
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他在第七回合中被打倒了。
He was laid out in the seventh round. -
古罗马历中自三、五、七、十各月的十五日起算的前第九日即三、五、七、十各月的第七日；其它各月的第五日
The ninth day before the ides of a month; in the ancient Roman calendar, the seventh day of March, May, July, or October and the fifth day of the other months. -
九和弦由第三、第七和第九三个基础音组成的和弦
A chord consisting of a root with its third, seventh, and ninth. -
它刚出版了第七版。
It has just entered the seventh edition.
