他们需走路小心，避开扔满了塑料袋的黑色地带，而那些塑料袋有些已经破裂，露出了里面的垢物。
Careful steps were required to avoid the black stream littered with telltale plastic bags.
健康护理律师robert Falk警告说：“但还是存在一些黑色地带，很多这样的地带。”
"But there's still a lot of gray areas here, and a lot of areas," cautioned healthcare attorney Robert Falk.
可是，黑色外表为各种复杂形式的物种所有，它们栖息在不同地带、有白天活动的也有黑夜活动的、有在地面生存的也有在树上生存的。
Melanic forms, though, are particularly prevalent in species with complicated lives—those that inhabit a range of habitats, are active both day and night, and move between the ground and the trees.
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