X factor
noun/ˈeks fæktə(r)/
/ˈeks fæktər/
[singular]- a special quality, especially one that is essential for success and is difficult to describe
特质，X 因素（尤指获得成功所必需又难以描述的素质） - She certainly has the X factor that all great singers have.
她确实具备所有伟大的歌唱家所拥有的特质。 - The effect of the weather on production costs is always something of an X factor, or unknown variable.
天气对生产成本的影响始终是一个X因素，或者说是未知变量。
- She certainly has the X factor that all great singers have.