Because, as the viewing angle changes, so does the path length. .

因为，随着视角的变化，路径长度也会发生变化。

The team found that the beetles prevented from seeing the sky by their caps had path lengths that averaged 476.7cm, much longer than the average of 143.4cm travelled by the beetles wearing clear hats.

试验人员发现被帽子遮挡了天空的蜣螂平均行走476.7cm，远远超出戴着透明帽子的蜣螂的平均路程143.4cm。