You fence the perimeter to keep out cows and people.
你用篱笆把四周围起来，把牛和人们都隔在外面。
Couldn't I just line the perimeter of my yard with something to keep them at bay?
我不可以只用什么东西在我的院子周围画线来隔绝它们吗？
When Bob planted a garden, he put up little hedges all around the perimeter of his yard to help keep out pests that would eat the prized vegetables he worked so hard to nurture.
鲍勃种植花园时在他的院子周围圈了一圈很小的篱笆，这样做是为了使他精心培育的名贵植物不受动物的践踏。
You fence the perimeter to keep out cows and people. Then you walk away.
你用篱笆把四周围起来，把牛和人们都隔在外面。
Now, they can keep their efforts on shoring up the perimeter.
现在，他们可以把全部精力都放在外线。
Now, they can keep their efforts on shoring up the perimeter.
现在，他们可以把全部精力都放在外线。
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