text_1: 区别 原发性 HLH 和 继发性 HLH 不 一定 有 意义 , 因为 两者 通常 都 是 由 感染 诱发 , 而且 两者 都 有 使 患者 对 该 综合征 具有 易感性 的 基因突变 .
  
text_2: the distinction between primary and secondary HLH is not always useful , since both are often triggered by infections and both often have underlying genetic mutations that can confer a predisposition to the syndrome .
  