used to indicate that something specified will have a powerful, though unpredictable, influence on a result or outcome
…這一因素（指對結果會產(chǎn)生難以預見的有力影響之物）
the feel-good factor.
幸福感這一因素。
include (or exclude) something as a relevant element when making a calculation or decision
（計算或作決定時）包括（或排除）某一相關因素
when the psychological costs are factored in, a different picture will emerge.
如果將心理成本計算在內(nèi)，結果就不同了。
To figure in
包括，把…計算在內(nèi)
We factored sick days and vacations in when we prepared the work schedule.
當我們準備工作時間表時，我們把病假和假期都包括在內(nèi)