我在一月份买了一辆自行车。

I bought a bike in January.

这个项目在一月份开始。

The project began in January.

我们计划在一月份去滑雪。

We plan to go skiing in January.

一月份是新年的开始。

January is the start of the new year.

一月份的天气通常很冷。

The weather in January is usually very cold.

一月份有很多新年活动。

There are many New Year activities in January.

一年中最冷的日子通常在一月份。

The chilliest days of the year are usually in January.

一月份的日子比十二月份的日子要长一些。

The days in January are a bit longer than those in December.

根据规章制度，年度会议必须在一月份举行。

According to the bylaws, the annual meeting must be held in January.

每年一月份，坐火车旅行的费用都会增加。

Every January the cost of travelling by train rises.