several factors

• 多因素

several factors的用法和样例：

例句

1. There are a number of factors that baffle its development.
   还有着很多因素阻碍着我国新闻周刊的发展。
2. Many factors complicate efforts to calculate a case fatality ratio while an outbreak is still evolving.
   疾病仍处于暴发期时很多因素使计算病例病死率的努力复杂化。