If those two branches in turn each split into two branches, the area of the cross sections of the four additional branches together will equal the area of the cross section of the trunk. And so on.
这条的规律可以简单描述为：如果一根树干分叉为两个树枝，那么两个树枝的横截面积之和等于树干的横截面积；如果树枝接着分别分叉为两根小树枝，那么这四个次生分枝的横截面积总和仍等于树干的横截面积……依此类推。
The four-point bearing (also see page 9) is suitable for accommodating tilting forces at a small cross-section.
四点轴承（也请参见第9页）是容纳在一个小截面适当倾斜力量。
Their conical sphenoid part, for the configuration of which at least four conical surfaces are used, can have the same cross section all over its length or different cross-section per parts.
圆锥楔形体的结构至少有四个圆锥面组成，在每个面上，可以使用相同的横截面，也可用不同的横截面。
Gaussian beams can be judged and measured using a new method described here which measures only the intensities on four coordinate points in the same cross section of the measured beam.
提出一种判别和测量高斯光束的新方法。在截面内对任意等距四点采光测量，就可判别和测量此高斯光束。
The kitchen island is made from a cross-section of a Washington sequoia tree with a live edge, and has a built-in four-burner Wolf range.
厨房岛台由一棵华盛顿红杉树的横截面制成，采用原木自然边，带有嵌入式Wolf四灶炉具。
There were significant differences in the cross-section areas′ changes of the velo-pharyngeal among the four groups.
各疗效组患者手术前后腭后区截面积的变化差异有统计学意义。
We have designed four joint, JD-1 is designed for the comparison, and the others consider the cross-section size, reinforcement and the shear ring number.
结果表明：增大环梁截面、提高环梁的配筋率和增加抗剪环数量能不同程度的提高环梁节点承载能力。
We have designed four joint, JD-1 is designed for the comparison, and the others consider the cross-section size, reinforcement and the shear ring number.
结果表明：增大环梁截面、提高环梁的配筋率和增加抗剪环数量能不同程度的提高环梁节点承载能力。
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