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In order to study basic roof's destruction movement that affects working face in horizontal section top coal caving in mining steep seams, this paper analyses tension of roof using elastic and thin board theory and concludes criterion of roof destruction based on long and narrow thin board.

摘要为研究急斜煤层水平分段放顶煤开采过程中基本顶破坏活动对工作面的影响，根据急斜煤层基本顶具有倾斜狭长板的特点，运用弹性薄板理论对基本顶岩层进行了拉应力分析，得出了顶板破断的判别准则，建立了基本顶初次破断后形成的&铰接结构&的力学模型。

On a coal face of horizontal slice of steep seam ,the combination of ∏ type built-up roof beam and individual hydraulic support is regarded as key support.

在急倾斜煤层水平分层采煤工作面，采用∏型组合顶梁与单体液压支柱结合作为基本支护，大大增加了工作面的支护强度，提高了劳动生产率，降低了工作面管理难度和材料成本。

Trail conditions were generally good, but included a variety of terrain including a lot of loose sharp rocks, some boulders, rock hopping, and some pretty steep and rocky parts with good ankle-twisting potential.

平地的条件是相当好的，但是包括各种地形，像尖岩石，一些大石头，和陡峭的岩石，这些都有可能会扭到脚。

A steep high face of rock.

岩石的陡峭而高的一面。

Rapids are created when rivers are on a steep gradient, making the water flow very fast, when the flow is constricted into a narrower channel, or where an obstruction such as a boulder interrupts the river, causing eddies and swirling currents.

当河流的坡度陡斜造成水流变快的时候，当水流被挤入更为狭窄的河道的时候，或是在河流被巨石之类的障碍物阻隔从而引起旋涡和涡流的地方，就会形成急流。

Such as adaptation to the hard seam roof conditions resistance to a strong frame, adapted to the big mining thick coal seam mining height and caving hydraulic support, adapted to thin seam mining and steep seam mining and other special stent.

如适应于坚硬煤层顶板条件的商阻力强力支架，适应于厚煤层开采的大采高和放顶煤液压支架，适应于薄煤层开采和急倾斜煤层开采的特种支架等。

"We have steep valleys and many types of mature trees here, as well as rough ground that humans don't disturb," he said, after spotting a red-vented bulbul.

&我们有陡峭的山谷和许多类型的在这里大树，以及粗糙地面，人类请勿打扰，&他说，后发现一个红色的密封白头翁。

Of deep-sea Fishing s he heard tell, and mighty silver gatherings of the mile-long net; of sudden perils, noise of breakers on a moonless night, or the tall bows of the great liner taking shape overhead through the fog; of the merry Home -coming, the headland rounded, the harbour lights opened out; the groups seen dimly on the quay, the cheery hail, the splash of the hawser; the trudge up the steep little street towards the comforting glow of red-curtained windows.

他听他讲深海捕鱼，用一哩长的大网捞起银光闪闪的鱼群；听他讲突如其来的危险，在月黑风高的夜晚，排山巨浪的狂吼，还有大雾天头顶上忽地冒出巨轮高耸的船头；听他讲返回故里的欢乐，船头绕过海岬，驶进灯火通明的海港；码头上人影晃动，人群在欢呼，大缆索啪地甩了过去，水沫四溅；他们吃力地走上陡峭的小街，向那挂红窗幔的温煦快意的灯光走去。

What to do in a place like this- You can swim, surf, dive, sail, golf, play ball, ride, explore, bargain hunt, sight see, explore, or drive a dune buggy for 100 miles in any direction, take a jeep up a steep mountain trail.

怎样做一个这样的地方--你可以游泳、冲浪、潜水、风帆、高尔夫、打球、骑、探索、亨特讨价还价，看到的景象，探索，或径为100英里的沙丘派上外太空任何方向一辆吉普车采取了陡峭山步道。

They normally ski off-piste and in the back country, but can also be seen dropping off of steep cliffs in the back bowls at some mountains.

他们通常滑雪越野滑雪和背部的国家，但也可以看出掉落悬崖陡峭的背部碗在一些山区。

The concept of equivalent rotationally rigidity is offered and the formula of rotationally rigidity is obtained.

主要做了如下几个方面的工作：对伸臂位于顶部的单层框架—筒体模型进行分析，提出了等效转动约束的概念和转动约束刚度的表达式。

Male cats normally do not need aftercare with the exception of the night after the anesthetic.

男猫通常不需要善后除了晚上的麻醉。