frontieră 英語で:

In the United States, the frontier moved steadily west throughout the 19th century.

Many families left to make a new life on the frontier.

The 20th century has vastly expanded the frontiers of human knowledge.

This is a novel about a family's struggle on the American frontier.

More or less authoritarian leaders will guarantee that beyond the eastern frontier of the Union there will be territories which will never pose any direct threat but will instead be decent economic partners.

Can the xitiziens of Mexico cross the frontier with the USA without any limits?

to cross the social frontiers

I live in a city close to the German frontier.

Pioniers pushed the frontier of US border further and further towards the west cost.

France's frontier with Belgium

The soldiers proceeded to the frontier with caution.

Where the frontier of science once was is now the centre.