It's the second time in two years the event has been cancelled midstream.

这是该活动两年内第二次被中途取消。

A midstream link, with 1,300km of new canals, is supposed to open by October 2014.

长达1,300千米的中游调水线预计于2014年十月贯通。

I see no reason to change horses midstream.

为什么要半途换马啊。

If he'd known how that creek would rise when they were in midstream, he would never have let Jack try to swim it.

如果他知道当他们在中游时那条小溪会如何上涨，他将永远不会让杰克尝试游泳。