passage for heat transfer medium

例句：

1. 1. The engineer designed a new passage forthe construction project.
   工程师为建设项目设计了一条新通道。
2. 2. The old house had several narrowpassages that led to different rooms.
   这所老房子有几个狭窄的通道，通向不同的房间。
3. 3. The passage was so narrowthat only one person could pass through ata time.
   通道非常窄，一次只能通过一个人。