树干的

Models for the electromagnetic interaction between the target and trunks or between the trunks and trunks are developed, and these models are used to derive the coherent fields scattered by the target and fractal forest. Then, the polarization angular correlation function is calculated by using azimuthal angular averaging, and used to detection target buried in forest.

本文用L系统对森林环境进行了理论建模；研究了有限长分层介质圆柱的树干散射模型；分析了倾斜粗糙地面上树干及分形树的电磁散射特性；讨论了环境对确定目标电磁散射特性的影响；研究了环境与隐蔽目标复合电磁散射，用角相关函数、极化角相关函数对隐蔽目标进行了检测。

Indeed, far from carrying the building's main loads, as the trunk of a tree does, the shinbashira—made from precious straight-grained Japanese cypress—is not even rooted in the soil.

事实上，建筑物主要负荷绝不是被称作"心柱"的树干（由日本的名贵直纹柏树制成）承受的——甚至这个树干没有牢固地立于地基上。

Every year an oak tree adds precisely one ring of growth on its outside, just underneath the bark, to its trunk and all its branches.

在树干皮下面从树干以及所有的分支上，橡树每长一年都要精确的向外增加一个环。

Cacao tree is a kind of small arbor tree and it has the following outstanding features. First, cauliflory: its flowers burst open on the tree trunks directly and then the flowers will produce fruits on the tree trunks too. The cacao flowers are small, but the fruits are big. The fruits are elliptical and have many ridged lines on the outer skins. The color of the fruits is yellow, and each fruit can grow as heavy as one kilogram. Each cacao plant can grow 60 to 70 fruits, and there are about 30 to 50 seeds in each fruit.

可可是一种有趣的梧桐科小乔木，它最大的特点是&老茎生花&和&老茎结果&，花直接开在树干上，果也直接结在树干上，花小而果实大，果子呈椭圆型，表面有一条条棱形线突出，橙黄色，每个果子重达1千克左右，每株可可树可结60-70个果子，一个果子内有30-50粒种子，巧克力的原材料就是这些种子。

The results show that: Basic density,tracheid length,tracheid width and the ratio of the tracheid length and width increase from core to bark; basic density has a small decrease from base to top,but the change is not significant;The tracheid length,tracheid width and the ratio of the tracheid length and width increase step by .step from the base up to certain height and then decrease by degrees.

基本密度自树干基部向上呈减小趋势，但变化不大；管胞长度、管胞宽度及管胞长宽比自树干基部向上呈&小—大—小&的变异规律；木材的化学成分含量和PH值除抽提物含量随着树高的增加而下降外，其它指标在树高方向上的变化未呈现明显规律性。

The composition and distribution of lichens were influenced by the aspects of the trucks, host trees and their sizes. Richer number and amounts of lichens are found on southern aspect of trunks. Vaccinium duclouxii was the host tree with the richest epiphytic lichens in the forests in the area . Most epiphytic lichens occurred on medium stems of DBH 5.0–25.0 cm.

树干方位、宿主种类和宿主径级等都对附生地衣的物种组成和多样性有着重要影响，附生地衣更多地出现于树干南向方位，云南越桔的附生地衣最为丰富，胸径5.0–25.0 cm 的树木上附生地衣较多。

The distribution of soil pH around the boles of spruce and larch growing in liangshui Natural Reserve and Harbin City was studied in order to find out the effect of stem flow on soil pH.

为了解树干径流对林下土壤PH的影响，在凉水自然保护区和哈尔滨市内，取样分析了云杉和落叶松树干周围的土壤pH分布状况。

Any of several Australian eucalypts having the bark smooth except at or near the base of the trunk.

几种除树干基部和接近树干基部外树皮光滑的澳洲桉树的任意一种。

This article through to the small leaf oak branch moisture contentdetermination and the analysis, take the small leaf oak's bough highlyas an independent variable, take the corresponding high branchmoisture content as the dependent variable,Uses the linear theory to construct the bough moisture contentestimation mathematical model, studies the small leaf oak boughmoisture content the distributed rule.

本文通过对小叶青冈主干含水率的测定和分析，以小叶青冈的树干高度为自变量，以相应高度的主干含水率为因变量，采用线性理论构建树干含水率估测数学模型，研究小叶青冈树干含水率的分布规律。

The tree-trunk stands firm and unshakable, but from it und around it it spreads and grows colourfully and multilayered in bulges and crevasses, in lines, structures, forms and colours.

树干深根茁壮、不动摇，不过，树干本身和它的周围的肿块和裂缝中，开始多彩扩张和多层生长，产生线条、结构、造型和色彩。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了