blowing down
拉开：在数学中
常用释义
英式发音
美式发音
基本释义
- 拉开：在数学中，拉开（法文：éclatement，英文：blowing up）、单项变换或σ-过程是一种几何的操作，代数几何中的应用尤重。拉开是双有理几何的基本工具。对代数簇或复流形上一点Z的拉开是将该点换为该点法丛的射影丛，或者具体地说是换为该点切空间的射影空间，从而得到拉开态射Bl_Z:~→M，这是一个双有理等价。对较高维子流形也能定义拉开。
例句
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1·There's a funny smell of soot blowing down the chimney.烟囱里倒灌进一股刺鼻的煤烟。
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2·The wind–the wind! There's a funny smell of soot blowing down the chimney.风啊——风啊！ 烟囱里倒灌进一股刺鼻的煤烟。
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3·Trees have fallen, limbs are blowing down and debris is scattering the roads.树被刮倒，树枝也被刮落，路上到处都是残瓦碎片。
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4·Accumulated dirt and sludge can be removed by "blowing down" through the drain in the bottom of trap.通过疏水阀底部的排放阀可以清除累积的污垢和淤泥。
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5·Mama's down there gardening, and everything keeps blowing away on her.妈妈在花园里，她的东西都快被风吹走了。
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6·The dog ran down again, and up again; and this he continued until both trumpets stopped blowing, and the meals were over in both castles.狗于是又下山，上山；一次又一次地重复着，直到两边的号角都不再吹响，这时两座城堡的人也都吃完了饭。
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7·And when the Israelites besieged Jericho, they carried the Ark around the city for a week, blowing trumpets until, on the seventh day, the walls fell down, allowing easy conquest.并且当以色列人围攻耶利哥城时，他们抬着约柜，吹着喇叭，绕城绕了一个星期，终于在第七天城墙垮了，得来全不费功夫。
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8·Lots of science fiction is populated by sweet laser cannons shooting down spaceships or blowing up whole planets.很多科幻小说里充斥着用激光大炮打飞船或是摧毁整个星球的华丽情节。
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9·These weird and wonderful snails live a bizarre upside-down life staying afloat in water by forever blowing bubbles.这些稀奇古怪的蜗牛在水中过着奇异的倒置生活，并且永远吹着泡泡。
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10·But at times, regional electric lines have been so congested that Maple Ridge has been forced to shut down even with a brisk wind blowing.可是，有时地区输电线路拥塞太严重，即便风力条件非常理想，梅普瑞吉风电场也不得不被迫停止运行。
同义词