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N-COUNT
障礙；壁壘；阻礙
A barrier is something such as a rule, law, or policy that makes it difficult or impossible for something to happen or be achieved.
例句
Duties and taxes are the most obvious barrier to free trade.
關稅和稅收是自由貿易的最大壁壘。
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N-COUNT
隔閡；阻礙
A barrier is a problem that prevents two people or groups from agreeing, communicating, or working with each other.
例句
There is no reason why love shouldn't cross the age barrier...
愛沒有理由不能跨越年齡的阻礙。
She had been waiting for Simon to break down the barrier between them...
她一直在等待西蒙打破他們之間的隔閡。
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N-COUNT
關卡；柵欄
A barrier is something such as a fence or wall that is put in place to prevent people from moving easily from one area to another.
例句
The demonstrators broke through heavy police barriers...
示威者們沖破了警察的重重設防。
As each woman reached the barrier one of the men glanced at her papers.
每一位女士來到關卡前，其中一個男士便會掃一眼她的證件。
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N-COUNT
障礙物；擋板；屏障
A barrier is an object or layer that physically prevents something from moving from one place to another.
例句
...a severe storm, which destroyed a natural barrier between the house and the lake...
猛烈的暴風雨摧毀了房子和湖之間的一道天然屏障
The packaging must provide an effective barrier to prevent contamination of the product.
包裝必須提供有效的保護，以免產品受污染。
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N-SING
大關；界限
You can refer to a particular number or amount as a barrier when you think it is significant, because it is difficult or unusual to go above it.
例句
They are fearful that unemployment will soon break the barrier of three million...
他們擔心失業人數很快將突破300萬大關。
The Popular Front failed, as expected, to pass the 5 per cent barrier.
不出所料，人民陣線沒能突破5%大關。