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Put it on both sides of the road, such as the general cement block.
When cars passed, the flow of air will enter the hole,
and go out to the exports on both sides.
So leaves on the road side will be gathered.
It can reduce the hard work before cleaning.
Southern Taiwan University
No.29-35, Xiaokanglang 1st Rd., Puzi City, Chiayi County 613, Taiwan (R.O.C.)