在这些人中较弱的病毒引起的疾病进展缓慢。
The weaker virus causes slower disease progression in these people.
但是修正那些导致很多人类疾病的遗传错误的方法则进展缓慢。
But ways to correct the genetic mistakes that cause many human diseases have been slower to arrive.
她说：“这是一种进展缓慢的疾病，大多数情况下，我们有时间、也有机会分辨出哪种治疗策略是最好的。”
"This is a slowly progressing disease and most of the time we have the time and opportunity to determine what's the best [treatment strategy] for our patients," she said.
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