即便病患来寻求医疗帮助，治疗也存在一定的困难。
Even when patients seek medical help, treatment can be difficult.
很多科学家认为，即使是小型生物在这种长达数月的完全黑暗中生存下来也存在着一定困难。
Many scientists assumed that even smaller organisms would struggle just to stay alive during months of almost complete darkness.
很多不是色盲的人在识别和区分紫色和其它颜色上也存在一定的困难。
Many are not color-blind people to identify and distinguish between purple and other colors are also there are some difficulties.
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