目标化合物以甘油、硝基甲烷为三方向起始核心，以从季碳原子三倍对称分散的化合物1～3为分支侧链。

Three branched monomers 1 ~ 3, possessing 3 - fold symmetry and branches emanating from a tetrahedral carbon branch point, were utilized as the key building block in the dendrimer syntheses.

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第二条分支到树的特殊遍历中（有关详细信息，请参阅 following-sibling 轴线侧栏）。

The second one branches off into a special walking of the tree (see the The following-sibling Axis sidebar for details).

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空气在进入气管前被加热了，在气管的底部分成两个导气管通向每一侧的肺，这两人分支被叫做支气管。

The air is warmed up before passing down the windpipe, where it's divided at the bottom between two airways called bronchi that lead to either lung.

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