变冷

A mathematical model of the Secondary Cooling Segment Electromagnetic Stirring in the billet Continuous Casting is proposed according to the theory of alternating magnetohydrodynamics and magnetic boundary renewal method, then the cause of electromagnetic Stirring phenomena and the effect of operational condition were investigated.

根据正弦时变电磁场条件下的电磁流体力学基本理论及磁场边界更新法，建立了方坯连铸二冷区电磁旋转搅拌的数学模型，并对电磁搅拌的机理和操作条件的影响作用进行了探讨。

The mine ventilation system reliability is a maintainable system with complex, change with time and contain cool-stock components.

矿井通风系统是一个复杂、时变、含有冷储备部件的可修系统。

There are two prevailing models for the lithospheric thinning of the North China craton:(1) delamination,(2) thermal erosion and chemical metasomatism.

底侵玄武质岩浆的加热并弱化先前的冷和强的克拉通地壳，创造一个流变学条件，以使收缩构造变形和陆壳加厚成为可能。

The early stage of me tamorphism happened before deformation in the upper mantle at about 60-70km. Then metagabbro emplaced rapidly at about 40 km by diapirism and perhaps amalgamated with cool subducted oceanic crust. After that, rapid cooling retrograde metam orphism occurred. Early rapid ocean spreading was constrained because subduction appeared. Therefore, metagabbro continued to uplift under the slow extension. At last, it obducted and thrusted to outcrop on the surface.

变形前的早期变质可能发生在60～70km处的上地幔，然后变质辉长岩快速"底辟"构造侵位，上升至约40km深处，可能与俯冲的冷洋壳并置，发生快速降温退变反应；因俯冲作用的开始，抑制了洋盆快速扩张，变质辉长岩在减速伸展环境下继续抬升减压；后期又由于仰冲推覆，最终出露地表。

The O stands for overexertion. Avoid activities that will make you sweaty. Wet clothes and cold weather are a bad mix.

过度的运动会使人变得很吃力，湿的衣服和冷的天气同时出现则是最糟糕的。

But these first rubber overshoes and raincoats were all soft and sticky in summer, and hard and unelastic in the winter when it was cold.

但是，最早的套鞋和雨衣在夏季都是又软又粘，到冬季天冷时，却又变硬而无弹性。

Presents the design of heating ventilating and air conditioning systems in which low temperature hot water floor panel heating systems in winter,variable refrigerant volume split air conditioning systems in summer,and central ventilation systems through all-year are adopted.

介绍了该工程的供暖系统、空调系统及通风系统的设计。冬季采用低温热水地板辐射供暖，夏季采用变制冷剂流量多联分体式空调系统供冷，全年采用集中新风系统供给新风。

Calculation and analysis are made on the variable pressure operation capabilities of the water wall system, superheater and reheater systems of the 300MW once-through boilers of Chinese design and evaluations of the fatigue life of major components are given based on the results of the analysis.

本文以计算分析为手段，对国产30万千瓦直流锅炉的水冷壁系统、过热器及再热器系统的变压运行能力进行了分析，并对主要部件的疲劳寿命作出评价。

The wind rose and it became freezing cold.

起风了，天气变得非常冷。程度状语

The climate warmed and cooled, new plants and animals evolved and became extinct in their turn, and sea levels rose and fell over periods of thousands, if not millions, of years.

气候变暖又转冷，新的植物、动物进化又渐次灭亡，海平面上升而后下降，这样的变化如果不是需要数百万年的时间，也是需要数千年的时间的。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。