barrier ['bæriə]

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n. �ϰ�����ϣ�����
vt. �ѡ�����դ��

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n. roadblock

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1. Green barrier is nowadays trade obstacle that enterprises have to face in international trade.
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2. Using the curving characteristic at the normal temperature, designs the more perfect sound barrier.
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3. Although the UML defines a precise language, it is not a barrier to future improvements in modeling concepts.
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n.
  1. a structure or object that impedes free movement
  2. any condition that makes it difficult to make progress or to achieve an objective
  3. anything serving to maintain separation by obstructing vision or access

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barrier
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Barrier coat
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protective barrier
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barrier plate
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median barrier
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