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1. The transitional epitheliumis responsible for the exchange of materials betweenthe blood and the tissues.
过渡上皮负责血液和组织之间的物质交换。
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2. During thetransitional period, there are many changesin the environment that can affect the healthof the population.
过渡期，环境变化很多，会影响人口健康。
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3. The transitional epithelium plays a crucial role inwound healing and tissue repair.
过渡上皮在伤口愈合和组织修复中起着至关重要的作用。