n.邊界；邊境；尖端；邊緣

We were turned back at the frontier. 我們在邊界那兒被趕了回來。

Everything is quiet on the frontier. 邊境上一切安靜。

This new frontier incident probably means war. 這個新的邊境事件可能導(dǎo)致戰(zhàn)爭。

The minority of us are confronted with difficulty in the frontier of the major. 我們少數(shù)人在該專業(yè)尖端領(lǐng)域面臨困難。

The frontiers of medical knowledge are being pushed forwards as time goes on. 醫(yī)學(xué)知識的新領(lǐng)域正隨著時間向前推進(jìn)。

He came from the remote frontier. 他來自遙遠(yuǎn)的邊疆。

n. (靠近未開發(fā)地帶的)邊遠(yuǎn)的居民； 邊遠(yuǎn)者

adj.在國境外生活的