frontier ['frʌntjə]

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n. ǰ�أ��߽磻����
adj. �߽�ģ����ص�

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border��bounds��boundary��frontier��limit
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1. The village straddles the frontier.
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2. This is a novel about frontier in the United States.
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3. To settlers on the frontier, Jackson was already well known.
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n.
  1. a wilderness at the edge of a settled area of a country
  2. an international boundary or the area (often fortified) immediately inside the boundary
  3. an undeveloped field of study; a topic inviting research and development

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frontier
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Frontier Airlines
�߽����չ�˾; �߽�����; �߾����չ�˾; �߾�����;
frontier orbital
ǰ�ع��; ǰ�ع��� ǰ�ع��; �޽����; ǰ�ع���;
frontier education
�߽�����; ��������; �߽����� ���� �γ�;
customs frontier
�ؾ�; ��˰����; ���ر߽�; �ؾ�,��˰����;