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It is shown that the value of differential cross section of 〓He from 〓He+〓Be breakup reaction is approximately two-times larger than that from 〓Li+〓C reaction at similar incident energy.

与相近能量的〓Li+〓C的破裂α碎片微分截面相比〓He的破裂α碎片的微分截增大了约一倍。

Numerical differentiation is that derivative value of a function at a certain point is approximately solved in discrete method.

中文摘要：数值微分就是用离散方法近似地求出函数在某点的导数值，关于数值微分已有许多求解方法，但这些方法都有各自的局限性，并且关于高阶导数近似逼近的方法研究相对较少。

Didn't the engineers design it to withstand a direct hit from a Boeing 707, approximately the same size and weight of the 767?

没有工程师的设计，它能够顶住直接击中，从波音707 ，大约有同样的尺寸和重量的767呢？

Disinflation of the early 1980s, during which inflation decrease by approximately 10%, was associated with a large recession, and its unemployment cost was close to the prediction of the traditional approach.

在通胀率下降了大约10%的时期，20世纪80年代早期美国的通货紧缩，与大的经济衰退是有关系的，而且其失业费用接近于通用的方法。

There will also be two petabytes of disk storage or holding the content of approximately one billion books.

还将有 2千兆兆字节的磁盘存储，或可容纳大约十亿本书的内容。

At the same time, the practical implementation of evolutionary algorithm is given in order that evolutionary algorithm is introduced into vector quantizer. In the fourth section the asymptotic theory of vector quantization is studied. Then the partial distortion theorem that when codebook size is large enough, each region of the partition makes an equal contribution to the distortion for an optimal quantizer, which is the key part of vector quantizer is obtained. Finally, the competitive learning algorithm based on the partial distortion theorem is proposed, which introduces the subdistortion of each region into the distortion measure to assure that the subdistortion of each region approximately equals to each other.

第四章详细研究矢量量化的渐近理论，然后得出了矢量量化器设计的核心部分——部分失真定理，当码本尺寸足够大且输出矢量的渐近概率密度与输入矢量的概率密度的幂成比例时，最优量化器划分的各个区域对该量化器的平均误差产生相同的影响，最后提出基于部分失真定理的竞争学习算法，它通过在误差测度中，引入与各区域相关的子误差以保证各区域的子误差近似相等，该算法实现较为简单，在一定程度上确保全局最优。

In principle, approximately 80% of all DMD patients could be treated with exon–skipping drugs.

原则上，大约有80例DMD％可以治疗外显子跳跃的药物。

In the following 5 years, approximately 2,650 Doberman Pinschers were registered with the AKC.

因此，在这段时期里，实际的比较情况是大约有40000只杜宾在德国注册，而有3400只在美国注册。

With quartz sand, limestone, dolomite, glass as the main raw materials, including glass, approximately 90%.

以石英砂、石灰石、白云石，玻璃等为主要原料，其中玻璃约占90%以上。

Distribution generates $650M; approximately 60 percent of suppliers are domiciled in the United States.

分销商产值为6.5亿美元，其中美国的分销商获得了大约60%的合同。

The two-acre Dunbar Community Garden in Little Rock has served as a model for several years.

几年来，坐落于小石城，占地两英亩的邓巴社区菜园树立了一个标杆。

Jerry points to the jacket hanging in the bathroom. It's ruined, and unwearable What?

杰瑞指着洗手间里挂着的夹克，毁了，不能穿了）什么？