The outside steel lagging fastens both ends of the pipe and wrap the gasket ring to realize the tight coupling between pipes.

外钢套扣住钢管两端并包裹密封圈。实现钢管密封连接。

youdao

Depending on what you call external and internal environment, this path that I'm tracing here, deep within your digestive system, is really directly connected to the outside world through both ends.

基于你们所谓的外环境和内环境,我在这里我所指的消化系统内部通路,它的两端确实与外界环境直接相通

耶鲁公开课 - 生物医学工程探索课程节选