The reason for the change is that now there are dozens of companies across the country buying discarded plastic soda bottles and turning them into fence posts, paintbrushes, etc.

这一变化的起因是，现在全国有几十家公司购买废弃的塑料汽水瓶，并把它们制成栅栏桩、油漆刷等。

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The fence posts were fixed firmly in the ground.

栅栏的立柱牢牢地固定在地上。

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Differences in the height of the fence posts add interest to an otherwise monotonic rhythm.

栅栏桩柱高度的差异给原本单调的节奏增加了趣味。

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The turf had been cut in preparation for raising fence posts.

BBC: Walking Hadrian��s Wall