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。
Waving can mean welcome and farewell, whereas scratching your head may indicate that you are at a loss.
挥手表示欢迎和告别，而挠头则表示不知所措。
The financial rescue plan passed by the US Congress is viewed as flawed but necessary to head off panic in financial markets and loss of confidence in the economy.
人们认为美国国会通过的金融纾困计划有缺陷，但对于防止金融市场中出现恐慌情绪、避免人们丧失对经济的信心，又是必要之举。
The sherry went to my head and I was im- poverished for days by the loss of sixpence.
六便士的酒钱落到我头上，接下来几天我几乎身无分文。 这里的女主人叫艾伦?
Hypothyroidism is an underproduction of certain hormones and is the most common cause of patchy hair loss known as alopecia areata (which can affect the whole body and not just the head).
甲状腺功能衰退症就是某种激素分泌较少，这是头发脱落形成斑秃的最常见原因(这可能影响整个身体而不仅仅是头部)。
Two years ago, his elderly mother began showing signs of memory loss after striking her head on the pavement outside her home.
2年前，年岁已高的妈妈在门口的人行道上摔到了头，之后开始出现失忆症状。
Concussions are a type of internal head injury that causes the temporary loss of normal brain function.
脑震荡是一种闭合性脑损伤，它会引起短暂的脑功能障碍。
Men tend to get all the more aggressive when they hit the highways increasing the chances of loss of control over the car, head-on collisions and roll overs.
上了高速公路以后，男司机们会变得更加势不可挡，这样失控、追尾、翻车的概率也就随之升高。
With inherited hair loss, men usually get bald spots around the forehead or on the top of the head, while women have thinning all over the scalp.
男性通常是前额或头顶的头发脱落，女性则是所有的头发变细。
To see expert solutions to gum disease and learn how to head off disease and tooth loss, check out how to Manage gum disease.
可点击如何防止牙周病来看看专家的意见，学习如何防止牙齿脱落和口腔疾病。
Alopecia areata (mild - medium level) usually shows in unusual hair loss areas e. g. eyebrows, backside of the head or above the ears where usually the male pattern baldness does not affect.
斑秃（早期—中期）通常是在眉毛，后枕部或者是在头的两侧这些本不容易掉头发的地方狂掉头发。
These phenomenon jeopardize the condition of the project seriously, and it is the main factor that influences the loss of local water head.
这些现象严重危害管道的工况，并且是影响阀道局部水头损失的主要因素。
The Newton iteration method is used to solve the economic pressure on the unknown node, so as to calculate the economic head loss and economic pipe diameter of each section,.
采用牛顿迭代法来求解各未知节点的经济水压，进而得出各管段的经济水头损失、经济管径和水源二级泵站的经济扬程。
Realistically speaking, in fact I'm not fat, everyone see me, I heard that my weight loss story, will be shaking his head, asked me so thin, why to lose weight.
平心来说，其实我不是很胖，每个人见到我，听说我减肥的故事，都会摇摇头，问我这么瘦了，为什么要减肥。
The valve is an impeding part with larger pressure head loss and a lot of discharge energy consumed.
风量调节阀系阻性部件，存在较大的压头损失，须消耗大量送风能量。
There will be other functional necessities: larger nostrils for easier breathing in off-planet environments, denser hair to contain heat loss from a larger head, reports Forbes.
福布斯网站报道称，人类同样会有其他功能性的需要：大鼻子有助于在外太空环境下的呼吸；因为头部较大，还要密集的头发来控制热量流失。
The loss of efficient head of circulation pump in the primary loop of PWR will increase with the increase of resistance coefficient of JetPump under forced circulation.
强迫循环条件下，压水堆一回路主循环泵有效压头的损失随喷射泵阻力系数的增加而增加；
Influential factors of friction factor of head loss are analyzed by adopting artificial neural network (ANN).
采用神经网络(ANN)方法对沿程水头损失系数的影响因素进行了分析。
The backwater and general formula of the local head loss of regulation structures is presented in this paper.
简述整治建筑物的壅水及其机理，归纳出局部水头损失壅水的通用公式。
This paper deals with the basic demands for designing filter tube and the head loss occurring when groundwater enters into the filter from aquifer.
论述了滤水管设计的基本要求和地下水由含水层进入滤水管时的水头损失。
The flow regime, sediment deposition and the loss of head of two head tanks of the sewage pumping station with different dimensions are studied by using a hydraulic model test method.
采用水力模拟的方法对两个不同结构尺寸的污水泵站高位井的水流流态、泥沙淤积及水头损失等进行了模型试验。
If the children have tinea capitis, in the head hair loss cure ago, Do not let children go to school.
如果孩子有头癣，在头部脱发治愈以前，不要让孩子去上学。
Actually, in the tube engineering, the proportion of the loss of local water head in the loss of pipeline water head is big.
在实际管道工程中，阀门阀道的局部水头损失占管路水头损失的比例是相当大的。
The basic equations describing unsteady flow in lock manifold are derived, in which various hydraulic loss and inertia head of culvert and ports are included.
在考虑了阀门井水流、各水头损失及廊道和支孔惯性长度的影响之后，推导了船闸廊道复合管非稳定流的基本方程组。
It is shown that the relationship exists among the location of the flaring gate piers, the Froude number at the section of starting flare, the weir head, the head loss and the gate width.
研究了宽尾墩位置、始扩点水流佛汝德数与堰上水头之间的关系，导出了与水头损失、闸门宽度有关的计算公式。
This paper presents a nonuniform slap door, whose top hinge refrains from impact when the door is opened and the head loss of the water is zero when the door running steady.
本文提出一种新的非均质拍门，可使拍门在启门时顶铰免受冲力，在稳定运行时拍门水头损失为零。
The calculation of local head loss in a pressured curved tube is very important for the design of the construction of inverted siphon.
有压弯管局部水头损失计算在倒虹吸等过水建筑物设计中至关重要。
If radiation is applied around the head or neck, hair loss will occur as Alopecia, and may not grow back.
如果辐射周围的头部或颈部的应用，如脱发脱发会发生，并可能无法重新生长。
Usually the cost of printing ink, head loss, by the media, and some film. The figure of waste composition.
通常喷绘的本钱由喷头损耗、墨水、介质、废图和覆膜挂轴等有些构成。
Usually the cost of printing ink, head loss, by the media, and some film. The figure of waste composition.
通常喷绘的本钱由喷头损耗、墨水、介质、废图和覆膜挂轴等有些构成。
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