仙女座经常被称为M31 ，自从它被梅西耶列为第31个弥漫天空物体。

Andromeda is frequently referred to as M31 since it is the 31st object on Messier's list of diffuse sky objects.

沙特排第22名。请再看一次幻灯片。孟加拉国第31名，巴基斯坦没有位列前31名名单中。

It is ranked 22 . Pls see the slides again. B'desh is 31 and Pokkistan is not in the list of 31.

我当时在第31步兵团的那个营里。

I was there with that battalion of the 31st

第31届八国峰会是在苏格兰举行的.

The 31 st G 8 summit was held in Scotland.

加拿大下跌13个榜位，跌至第31位。

Canada fell 13 spots to 31st place.

在1850年，它成了美国第31个州。

It became the 31st state of the United States in 1850.

第31条(施行日)本法施行日期以命令定之.

Article 31 The date of enforcement of this Law shall be prescribed by ordinance.

我们在第31号出口处离开了高速公路拐入支路.

We turned off the motorway at exit 31 into a side road.

第一届国际巫师联盟会议也在法国召开（《凤凰社》第31章）。

The first meeting of the International Confederation of Wizards was also held in France (OP31).

我国的“雪龙”号科考船正在南极进行第31次科考。

China's icebreaker Xue Long, also known as the Snow Dragon, is conducting the country's 31st scientific expedition to Antarctica.