双瘫性脑瘫很难治疗。
A：烟瘾是一种化学物质吸食成瘾，很难治疗。
A: Addictions are difficult to treat because of the biochemical dependencies our bodies have made to the addicting substance.
这两种疾病都属于严重的慢性致残疾病，很难治愈。
These are both seriously disabling chronic illnesses that are hard to exorcise.
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