There is a strict request on the water head allocation of aqueduct in main channel of Middle Route of North-South Water Transfer Project.
南水北调中线总干渠上渡槽等建筑物上的分配水头有严格要求。
参考来源 - 南水北调中线工程槐河（二）渡槽水力特性试验研究—《南水北调与水利科技》—2008年第1期—龙源期刊网·2,447,543篇论文数据，部分数据来源于NoteExpress
The turbine for the Three Gorges Project is one of the mixed-flow turbines with great changes of operation water head.
三峡电站水轮机是运行水头变幅最大的混流式水轮机之一，其外形尺寸和重量亦是当前混流式水轮机之最。
The water closed over his head.
水没过他的头顶。
We are keeping our head above water, but our cash flow position is not too good.
我们虽然还未陷入困境，但资金流转状况不太好。
When his head came out of the water for air, he saw that he was farther away from the soldiers.
VOA: special.2011.05.28
A man who loses his job tries to keep his head above water until he finds a new job.
VOA: special.2009.05.10
To keep your head above water is a colorful expression that means staying out of debt.
VOA: special.2009.05.10
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