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。
If I had longer legs, I would run faster.
假如我腿再长一点，我就能跑得更快了。
If I had longer legs, I'd be able to run faster.
如果我的腿再长一点儿，我就能跑得更快了。
The hair on your legs has grown faster during pregnancy.
怀孕后，腿毛生长迅速。
Donkey: I can't go any faster. My legs are getting weak. Where is the market? Why is it so far away?
驴子：（喃喃）我没办法走得更快了！我的腿越来越没力了。市场在哪里？为什么这么远？
Or command your legs to run faster when the bear jumps on your back.
或是当熊已经快扑到你的背上时控制好你的脚跑得更快一些。
I felt like a hamster in a cage. The faster my legs went, the less distance I seemed to travel.
我感觉自己就像是笼子里的仓鼠，走得见快不见远。
Reading in dim light won't damage your eyes, you don't need eight glasses of water a day to stay healthy and shaving your legs won't make the hair grow back faster.
在昏暗的灯光下看书不会伤害眼睛；每天不必喝八杯水来保持健康；剃掉腿毛也不会让它长得更快。
Reading gin dim light won't damage your eyes, you don't need eight glasses of water a day to stay healthy and shaving your legs won't make the hair grow back faster.
在昏暗的灯光下看书不会伤害眼睛；每天也不必喝八杯水来保持健康；剃掉腿毛也不会让它长得更快。 。
He tried to run faster, but his legs felt like jelly.
他想尽力跑快点，可他的腿直发软。
Not only does it stop my toddler from tearing up his mosquito bitten legs in the short-term, but it also helps the bites disappear faster.
它不仅让我的孩子短时间内不再使劲抓腿上蚊子叮咬的地方了，而且还能帮助让叮咬的小包消失的更快。
If I had longer legs, I "d be able to run faster."
如果我的腿再长一点儿，我就能跑得更快了。
Notes: While exercising your legs, your blood will be concentrated in your legs and this may make your heart beat faster or you may even feel a bit dizzy. Those effects are all normal.
注意事项：在您练习腿部时，血液会急速集中在你的下肢，或许会出现心跳急速加快或头晕，均属正常现象。
Suddenly he begins to run from the group, flying over the green grass, his legs carrying him faster and faster.
他突然离群飞奔，飞跃过绿荫，步伐飞快引领他向前。
Suddenly he begins to run from the group, flying over the green grass, his legs carrying him faster and faster.
他突然离群飞奔，飞跃过绿荫，步伐飞快引领他向前。
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