1. With sickle-cell disease, red blood cells look like bananas rather than, as is normal, round cushions.
rather than 而不是
What made you choose the one rather than the other?
你怎么選了這個而不是那個?
2. Other mutations are known to lessen sickle-cell’s impact, but most knowledge of genetic modifiers is particular to Europeans.
known to 已知
It must be stated that this illness is one of the most complex conditions known to man.
必須聲明,這種疾病是人類已知的最為復雜的疾病之一
。