One factor at a time 而其他参数都保持不变 ; 法
one-factor-at-a-time experiments 一次一因子实验法
Contradiction emerges only when a situation is viewed over time, because at any one moment, one factor or the other is in the ascendant.
只有随着时间的推移，一种情况的出现，矛盾才会浮现，因为在任何时刻，一方因素或另一个都会占支配地位。
Libraries are also limited to lending ane-book to one reader at a time, a factor that publishers say will limit the impact on sales.
图书馆一次也只能把一本电子图书借给一位读者。出版社表示，这个规定能够降低电子图书借阅对纸质书销售的影响。
Do you think one of the hurdles that needs to be overcome at this time is the idea of a key risk factor or a magic bullet treatment so-to-speak?
您是否认为这些因素中存在一个关键的危险因素或者是所谓的治疗的妙方呢？
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