Forts are built on the frontier.

炮台筑在边疆上。

There were no shops on the frontier.

边疆没有商店。

Illness was a big danger on the frontier.

在边疆上，疾病是一大威胁。

The soldiers were hardened to life on the frontier.

战士们顽强地面对前线的生活。

In the 1800s he planted apple trees on the frontier.

在19世纪，他在边境种植了苹果树。

The circuit rider was a religious man. He traveled on the frontier.

巡回牧师是一名宗教人士。他在边疆游走。

None of this is news to technology companies and those on the frontier of adoption.

这些对于那些站在科技前沿的企业来说不算什么新闻了。

Villages and towns began to grow on the frontier. Some became important cities.

在边疆上，村庄和城镇开始不断发展，其中一些变成了重要的城市。

A string of operations by the Pakistani army on the frontier revealed a lack of will and capacity for the fight.

巴基斯坦军方在边境地区的一系列动作显示出其缺乏战斗能力的现实。

The historical situation is further complicated by reference to the frontier, either in Kappadokia or on the Euphrates; this probably reflects two distinct layers in the poem.

一参考边境情况，要么是卡帕多西亚，要么是幼发拉底河，历史情形进一步复杂了；这也可能反映在诗歌里的两个不同层面。