接近地面的

Firstly, This paper processes geometry filtration based on character of orbit's apogee and perigee after orbit model is analyzed and based. Secondly Space Debris is separated into two kinds, coplanar and not coplanar according as location interrelation of target and debris. In Dynamic filtration's processing, considering prediction time limit and orbit perturbation, secular effects which have increaser effect is considered so that some need catching danger time point is appeased, some law about time when target and debris pass intersectant line each other is inferred, when debris and object are in different plane and some similar law also is inferred otherwise. The time list is arithmetical progression. These laws can improve calculation efficiency remarkably; Lastly orbit predict is a course approaching least distance. Danger time point in the last step become beginning time point from which debris and object's position and velocity are calculated by SXP4 Model which is an analytic model.By result, determine that relative movement trend is closer or apart, farther calculate the interval apart from time when predictive least relative distance occurs. Least relative distance and time when least distance occurs is calculated finally. It is a fast approach course adopting varied interval.

本文在分析、建立轨道摄动计算模型的基础上，首先采用基于轨道远、近地点特征对大量编目在册的空间碎片进行初步几何静态筛选，然后根据碎片与目标轨道面的相对位置特点把碎片分为异面与准共面两种情况以进行动态筛选，在筛选过程中考虑到预报时限长度和轨道摄动影响，引入了轨道摄动中具有积累效应的长期项以满足危险时间点的捕捉要求，利用了长期项摄动变化线性的特点导出了碎片与目标异面情况下各自过交线的时间序列成准等差数列的规律性和准共面情况下类似的规律性，从而显著地提高了前期轨道筛选的计算效率；最后对剩余危险碎片和目标飞行器利用SXP4轨道预报模型在前期轨道筛选的基础上以各个危险探测时间点为预报的时间起点，并根据预报计算结果，分析目标和碎片在该时间点的运动趋势是相互远离还是相互接近，推出预计最小相对距离发生时刻相对此刻的时间长度，得到其随时间变化的局部最小相对距离以及危险距离发生的时刻和相对速度，这是一个采用变时间步长、快速逼近最小相对距离的过程。

They would swoop in a curve close to the ground, catch an insect, and return to the swaying branch of a rosebush.

它们划着弧线俯冲到接近地面的地方，抓住一只虫子，又飞回摇曳的玫瑰枝。

He had to eat as he had never eaten before, to handle strange tools, to glance surreptitiously about learn how to accomplish each new thing, to receive the flood of impressions that was pouring in upon him being mentally annotated classified; to be conscious of a yearning for her that perturbed him in the form of a dull, aching restlessness; to feel the prod of desire to win to the walk in life whereon she trod, to have his mind ever again straying off in speculation vague plans of how to reach to her.

对她的渴望在他心里升起，那感觉以一种隐约而痛苦的不安困扰着他。他感到欲望催逼他前进，要他跻身于她的生活圈子，逼得他不断 ssbbww.Com 胡思乱想，不断 ssbbww.Com 朦胧地思考着如何接近她。而巨，在他偷偷窥视对面的诺尔曼和其他人，要想知道什么时候用什么刀叉时，心中也在研究那人的特点，同时 ssb§bww.com 不自觉地衡量8ttt8着、鉴定着——一切都是因为8 Tt t 8。

Simulations of echo intensity,maximum precipitation without orographic effects are much weaker than observations;and they are much improved and closer to the reality after consideration of orographic effects.

理想地形的对流过程虽然不能模拟出对流群中多单体的生消过程，但最大降水强度和累积降水都比平坦地面的大，更接近实测结果。

What satisfaction when, as we neared the summit, a couple of truck drivers almost veered off the road because they were gawping at us in disbelief rather than watching where they were going.

那是何等的满足感———我们接近山顶的时候，几个卡车司机差点把车开出路面，因为他们不是在看前面的路，而是以不相信的神情直瞪瞪地注视着我们。

On that morning the sky was intensely blue, the trees were washed and the fields well-watered by the recent rains and the people were going about their work; but it wasn't for this reason that heaven was very close to the earth.

那天早上天空湛蓝，树木被最近的雨水冲洗过，田地得到了很好的灌溉，人们正干着他们的活儿；但是并不是因为这个原因天空才非常接近地面的。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷