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上学路中,我看到有些环卫工人在扫地用的大扫帚上绑了密密麻麻的尼龙草(平时捆东西用的塑料绳).为什么要绑这些尼龙草呢?这样做就能把地扫得更干净吗?
On the way to school, I saw some sanitation workers tying up dense nylon grass (a plastic string used to tie things together) on the sweeping broomstick. Why bind these nylon grasses? Will this sweep the ground cleaner?