Is not sure if there is such a single factor.
不确定那是否有某种单一的因素。
It's hard to alter a single factor without altering others.
我们很难在不改变其他因素的情况下改变其中的某个因素。
Design: a single factor randomized controlled design was performed.
设计：单因素随机对照设计。
In a word, the occurrence of leftover children is not caused by a single factor.
总之，留守儿童的出现并不是由单个因素造成的。
The major points are: whether language aptitude is a single factor or multifactor construct;
主要内容有：外语学习能力是单因还是多因概念；
It can be a direct cause of death but is also the most important single risk factor for disease in young children.
它可以是死亡的直接原因，但也是导致幼儿患病的最重要的一个危险因素。
It can be a direct cause of death but is also the most important single risk factor for disease in young children.
它可以是死亡的直接原因，但也是导致幼儿患病的最重要的一个危险因素。
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