在树根处砍一个缺口，缺口的深度应该是树木直径的80%，其角度大约为70度。
Cut a 70-degree notch into the tree with a length of 80 percent of the trunk’s diameter.
树木直径的实际生长年龄小于树木年龄，用树木年龄作为自变量来描述直径生长会导致生长曲线出现拐点。
Description of the tree diameter growth using tree age as independent variable may thus give an inflection point of the growth curve.
定高树径测量仪是基于单片机、超声波测距、条形码识别等多种技术而开发研制的在树木确定高度情况下进行测量树木直径的一种新型测量仪器。
Trees s fixed high diameter meter is a new kind measuring instrument, which bases on many kinds of technologies such as the one-chip computer, ultrasonic and bar code discerning.
他们认为，树木将水分输送至叶片的整个过程中，具备的总叶脉直径应当是相同的。
The idea being that the tree needs the same total vein diameter from top to bottom to properly irrigate the leaves.
如果一个100英尺直径的小行星撞击地球，它在大气中爆炸产生的冲击波可以令数百平方英里内所有的树木倒伏，并杀死所有的大型动物。
If a 100-foot-wide asteroid hit Earth, the shock wave from its explosion in the atmosphere could flatten trees and kill every large animal for hundreds of square miles.
屋久岛最为典型的自然景观要属古屋久杉树，树龄均超过一千年，其中一些树木的直径达到5米。
The most typical natural landscape of Yakushima Island is its cedar named Yakusugi, the age of which can surpass one thousand years; some of the cedars' diameter can be 5 meters.
官员们说，一块直径450米的漏斗云在穿越堪萨斯州东部和西部时，将房顶揭起、树木连根拔起。
Officials say one funnel cloud measured 450 meters across as it moved through eastern Kansas and western Missouri, blowing roofs off homes and uprooting large trees.
目前，国内外在单株立木直径测量过程中，主要使用的还是需人工读取和记录测量数据的测径围尺或轮尺等树木测量工具。
Presently in standing tree's diameter measuring process, the main tools are tape meter or caliper, which need manpower to read and record measure data.
为了更好地表现树木在自然环境中的生长形态，在基于直径变化率的趋向性力学模型基础上，提出了一种模拟树木生长的综合力学模型。
In order to show the trees better in nature, based on diameter variety rate mechanical model, tree growth simulation 's integrated mechanical model is proposed.
为了更好地表现树木在自然环境中的生长形态，在基于直径变化率的趋向性力学模型基础上，提出了一种模拟树木生长的综合力学模型。
In order to show the trees better in nature, based on diameter variety rate mechanical model, tree growth simulation 's integrated mechanical model is proposed.
应用推荐