以下为句子列表：
英文: First, the agent coats the oil, serving as a physical barrier between the droplets.
中文: 一、乳化剂包裹住油滴，在油滴间形成一道物质屏障。
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英文: In the classic example, biologists imagine that a physical barrier arises, perhaps the formation of a new mountain range or the creation of an island resulting from a rise in sea level.
中文: 生物学家过去总是想像山脉隆起或者新海岛在海上冒出之类的地理隔离事件为例子。
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