2. Symbiotic alliances, on the other hand, bring
divergent branches of the tree of life together again, to intersect.

另一方面,共生联盟又把这棵生命之树上分叉的枝条重新拢到一起使之相交。
3. Both columns are floated "left" and then put inside a "row" DIV that equalizes the two columns'
divergent heights so the tallest one wins out.

这两个栏是浮动的“左”,然后在一个“行”的div,均衡的两列'不同的高峰,最高的一个将能胜出付诸表决。