uncertain element

• 不确定因素

uncertain element的用法和样例：

例句

1. Too many uncertain factors prevent us from being able to predict the sales volume.
   由于不确定因素太多，我们不可能实现定销。
2. Some uncertain factors in experiments could lead to the inaccuracy of test data.
   摘要试验中存在的多种不确定因素常造成试验数据不准确。