We need to factor time into our calculations.

我们需要将时间因素纳入我们的计算。

Engineers weigh similar, if less absurd, factors all the time.

工程师也是如此权衡问题，要少出错，就应考虑所有因素。

Some courses can even be done partly or entirely online, which means that you can manage your time more easily studying from home and you don't need to factor in travel time.

有些课程甚至可以部分或全部在网上完成，这意味着你可以更容易地管理在家学习的时间，而且不需要考虑出行时间。