混合轮询允许在连接保持的情况下出现事件时立即通知。

Hybrid polling allows for immediate notification as long as the events occur when the connection is up.

youdao

当等待连接的发起方(主机a)的确认时，连接保持挂起状态。

The connection is kept in a pending state while awaiting acknowledgment from the originator of the connection, Host a.

youdao

如果要实现流风格的Comet，那么需要使连接保持开启，但是仍然刷新数据。

If you wanted to implement a streaming style of Comet, you would want to keep the connection open, but still flush the data.

youdao

That cells that form tissues often have junctions that hold them together so that they don't fall apart and they exist as a solid piece of tissue.

组织细胞通常通过,细胞连接而联系在一起,所以它们不会分散开来,而保持坚固的组织形态

耶鲁公开课 - 生物医学工程探索课程节选