Though people of two countries cannot go across the border without permission, animals, however, can cross the border freely.

虽然两国人民未经许可不能越过边境，但动物可以自由跨过边境。

youdao

Your passport has expired; you can't cross the border without valid documentation.

您的护照过期了，没有有效证件您不能过关。

youdao

That could be followed by letting more people cross the border to visit relatives.

接下来或许让更多的人跨境探亲。

youdao

Supporters say the law will help reduce crime by illegal immigrants who cross the border from Mexico into Arizona.

VOA: special.2010.05.01

However,the Canadian government required that each person had to bring enough supplies to last for one year if they wanted to cross the border into Canada.

VOA: special.2009.02.11

Each time, it took several hours to get permission to cross the border.

VOA: special.2009.01.14

They were detained late on Sunday while trying to cross the border with Kenya, he added.

BBC: Tanzania church attack: Saudis held for 'act of terror'

As attitudes hardened, Mr Putin insisted that no gas at all should cross the border.

ECONOMIST: Russia, Ukraine and gas

Once that happens, they will cross the border to become the nerve center of postwar Iraq.

CNN: The governor-in-waiting