树

The average percent value of G C (49.3%) was less than that of A T (50.7%), there was a bias of the content of G, T in the third codon; The number of transition G-A and T-C were 22, 15 respectively, which were higher than that of transition A-G and C-T, the number of tranversion C-A, T-G is 2 respectively, and other tranversion patterns didnt occur; the probability of transition was higher than that of tranversion , Ts/Tv = 9.5-19, there was the highest number of transition in the third codon. The gamma parameter a of the lst,nd and 3rd codon positions were 0.00572,0.01237 and 1.05239 respectively, they showed that there was adifferent substitution rate at different codon position. Frequences of synonymous codon usage were relatively biased. The average rates of synonymous and nonsynonymous substitution were 0.0787, 0.0011 respectively, there was a significant difference between dS and dN (Z = 4.713, p.01), and the low ratio( CD = 0.0284 .3) of dN/dS ratio impled that there were selective constraints against the nonsynonymous sites in cyt-b gene, The distribution of nonsynonymous codon substitution pattern related to Grantharm distance indicated that the purified selection at 2nd codon positions was more intensive than that at 1st codon positions. The phylogenetic trees supported the view of the double origin of Chinese goose, which means that domestic Chinese goose was derived from Anser cygnoides and domestic European goose, and Yili was derived from Anser anser.

碱基含量分析可知，序列的G C含量(49.3％)＜A T含量(50.7％)，密码子第三位点的G、T含量都有较强的偏倚性；序列间G→A和T→C的转换数(22次和15次)高于A→G和C→T的转换数(10次和9次)，C→A、T→G颠换数均为2次，其余颠换模式均未发生；转换数明显高于颠换数，Ts／Tv=9.5～19，密码子第三位点的转换数最高，呈现了相当强烈的转换偏倚性；密码子第一、二和三位点的gamma分布参数α值分别为0.00572、0.01237和1.05239，表明密码子第一位点的替换速率变异最大，第二位点次之，第三位点的替换速率变异相对较小；编码同一氨基酸的同义密码子并非随机使用，表现出一定程度的使用偏倚性；同义替换速率和非同义替换速率分别为0.0787和0.0011，dS与dN值间的差异极显著(Z=4.713，p＜0.01)，而ω=0.0284，明显小于0.3，表明雁属鹅细胞色素b基因序列经历了中度净化选择作用；单步非同义替换(Sing-step nonsymonymous codon substitution，SSNCS)分布模式与Grantharm距离之间的关系说明密码子的三个位点所受的净化选择强度不同；构建的最大简约树与邻接树拓扑结构一致，支持中国家鹅的双起源学说，即除伊犁鹅外的其它中国鹅品种起源于鸿雁，伊犁鹅和欧洲的郎德鹅、莱茵鹅起源于灰雁。

In this paper, back projection algorithm used in ultrawideband impulse signal SAR is analysed, sidelobe resolution and distribution inhered in BP algorithm is obtained.

引 言可以穿透树簇、地表并能成像的机载雷达一直是民用、军用急需的技术。这一技术的实现包含有两层意思：①树簇及地表穿透；②成像。

Two of these giant trees can still be seen and they are referred to as the twin kauris one of the trees measures 41.5 metres in oheight while the other is 44.2 metres tall.

这些庞大的树中二棵能仍然被见到，而且他们被称为双胞胎的 kauris，当另一个是 44.2 公尺的时候，树之一在 oheight 中大小为 41.5 公尺高的。

I would not be a crippled tree, marring the landscape with its

我将不会是残树，以自身之疾坏了美景的残树。

Kapok earliest see Jin Ge Hong contained in the "Xijing Miscellanies": Western Han Dynasty, Wang refused to South Vietnam prestigious shows flames tree,"Er-foot, a three-ke, to King to Burning Home," said the flames kapok tree that tree.

木棉最早见载于晋葛洪的《西京杂记》：西汉时，南越王赵佗向汉帝进贡烽火树，&高一丈二尺，一本三柯，至夜光景欲燃&，据说此烽火树即木棉树。

South Cross-Island Highway has many huge trees and divine trees. Those trees make the highway more beautifully.

在南横可以看到许多的巨树与神木，这些树让这条公路变得更美。

Since all of the trees are open we can clean up the trees a lot more, removing redundant abilities.

因为所有的技能树都开放了，所以我们可以使得我们的技能树更加清晰明确，主要通过对没什么用处的技能采取不加点的方式。

Since all of the trees are open we can clean up the trees a lot more, removing redundant abilities.

因为所有的技能树都开放了，所以我们可以使得我们的技能树更加清晰明确，主要通过对没什麼用处的技能采取不加点的方式。

That the "wind sneaked into the night, moisten things silently" is the lingering rain, that the "Chanzao Lin more quiet, more secluded mountain bird" is a big mountain Vacant, that the "moon among pine photos, springs stone elite" is the autumn Yun Zhi, that "suddenly, such as spring night, the Trees 10000 Open Pear Tree" is a silent winter snows.

那&随风潜入夜，润物细无声&是春雨的缠绵，那&蝉噪林愈静，鸟鸣山更幽&是大山的空灵，那&明月松间照，清泉石上流&是秋的韵致，那&忽如一夜春风来，千树万树梨花开&是冬雪的静默。

Check out some of the most peculiar trees found in the different part of the world.

细数一下世界不同地方的一些最奇特的树。有些树有名是因为它们大、存在的时间长。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。