第九十九的英文：
ninety-ninth

参考例句：

Lot 99 is a pair of antique vases.
第九十九批拍卖品是一对古瓶。

ninety是什么意思：
num. 九十
n. 九十多；九十年代；九十岁
adj. 九十的；九十岁的

Your grade was in the nineties.
你的分数是九十几分。

Ninety per cent of inspiration is perspiration.
百分之九十的灵感是汗水。

He was born in the nineties of the nineteen century.
他生于十九世纪九十年代。

Over ninety percent of the islanders here are illiterate.

For the use of ninety and ninetieth see the examples at five and fifth
关於ninety和ninetieth的用法见five和fifth词条中的示例

ninth是什么意思：
num. 第九
n. 九分之一

The answer is ten to the ninth power.
答案是10的9次幂。

A chord consisting of a root with its third, seventh, and ninth.
九和弦由第三、第七和第九三个基础音组成的和弦

The score stood tied in the Bottom of the ninth inning.
在第九回合下半局比分持平

The Fourth Session of the Ninth National People's Congress
九届全国人大四次会议

Now the Yangtze River has been bridged for the ninth time.
现在扬子江上已架设了9座桥梁。