The ninth month of the year is September.

一年的第九个月份是九月。

youdao

The following month, in September 1914, Mackensen served in the Polish campaign, leading the siege of Warsaw and the attack on Lodz, by which time he had been appointed commander of Ninth Army;

1914年9月，马肯森在波兰战役中指挥了对华沙的围攻和对罗兹的进攻，这时他指挥第九集团军。

youdao

September is the ninth month of the year.

九月是一年中的第九个月。

youdao

The Swede, who endured a ninth-month goal drought between December 2008 and September 2009, has leapt into life this season.

BBC: Bolton 5-1 Newcastle

Household spending declined in September by 6% compared with a year earlier, marking the ninth consecutive month of year-on-year declines.

ECONOMIST: Overview