According to adjustable head fall mixer, the effect of mixer parameters on head loss was studied in the model experiment.

通过模型试验，研究可调式跌水网格混合器主要设计参数对水头损失的影响。

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Taking mixing uniformity as assessment index, the mixing performance and mechanism of adjustable head fall mixer with grids were studied in a plant scale experiment.

以混合均匀度为评价指标，通过生产性试验研究了可调式跌水网格混合器的混合性能及其机理。

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He let his head fall on his arm and abandoned himself to grief.

他一头倒在自己的胳膊上，陷入悲痛之中。

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A concussion happens when the brain is shaken, often in a car crash or a fall or a strike to the head in sports.

VOA: special.2009.10.28

It was extremely popular. Katharine Graham died of head injuries three years later after a fall.

VOA: special.2009.04.26

Then he would fall down on the floor again like a ball of dirt and start rubbing the side of his head with his back foot as if he had no idea he had been doing any more than any frog might do.

VOA: special.2009.08.29

These two games will go head-to-head this fall with the start of the next NBA season.

FORBES: Connect

But some African countries have seen farm output per head actually fall and they have still cut malnutrition more than India.

ECONOMIST: Many Indians eat poorly. Would a ��right to food�� help?

If I could choose anything for them to fall head over heels about it would be imagination and wonder.

FORBES: Don't Overlook Paper Mario: Sticker Stars Because it Breaks Convention