All trees would benefit from sticking to a pact to stay small, but natural selection drives them ever upward in search of the light that their competitors also seek.
所有的树都会从让自己变的更小而减少水分流失而受益，但是自然选择却驱使它们向上生长以和其他植物竞争中获得更多阳光。
To satisfy the interface conditions, the patient argument moves upward through selection, merging and movement, and becomes the subject at the sentence level.
为满足界面条件，通过选择、合并和移动，受事题元前移，成为句子层面的主语。
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