A creature must balance perfecting a skill or trait (building up legs to run faster) against experimenting with new traits (wings).
生物必须在完善现有技能、特质(练腿力以便跑得更快)与尝试新特质(翅膀)之间作取舍。
The higher you lift yourself off the ground, the greaterthe shock you have to absorb when landing and the faster your legs willfatigue.
你让你自己离地面越高，当着地时你不得不吸收更大的震动，而且你的腿会疲劳的越快。
After this I ran faster than my legs could take me out of his house, forgetting my friends until I stopped across the street and noticed they were right behind me.
见此情景，我撒腿就跑，都把朋友们忘在脑后了，等到我跑出房子，在对面街上停住脚步时，才发现他们都跟在我身后跑出了房子。
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