Head flow meter is one most widely used in present industry.

节流式流量计是目前工业上应用得最广的一种流量计。

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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。

《柯林斯英汉双解大词典》

Blood vessels in the head tighten to stop the loss of body heat and then relax to let blood flow rise; that sudden rush of blood is what causes the headache.

头部的血管收紧以阻止身体热量的流失，然后放松让血液流动起来，血液的突然涌入是引起头痛的原因。

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Not all of these benefits would flow from removing head-office duplication and overlapping operations such as mines and the railways linking them to ports.

ECONOMIST: BHP Billiton and Rio Tinto

With its head start, Cheniere expects to flow gas by the end of 2015, beginning annual exports of up to 800 bcf per year for 20 years.

FORBES: LNG Export Economics: A Look At Frontrunner Cheniere

Wells in shale plays have to undergo a process known as fracturing to boost the porosity of the rock and to make oil and gas flow to the well head.

FORBES: Baker Hughes Ramps Up Oil Fracking On Low Natural Gas Prices