- 释义：
- n. 边境；边疆；前沿，新领域
- 构词：
- front前面+ier人或物→n.国境,边境;尖端,新领域
- 例句：
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There were very few border controls on the southwestern frontier.
西南国界上没几个边境检查站.
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The frontier station was starved for food and water.
边防站急需食物和水.
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Areas near the frontier were rough and lawless in the old days.
过去边远地区混乱不堪,而且没有法律.
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