我们称这种变数为密度微分。
To rule out the variation in brain activity that would be expected when someone listens to a call normally, changes in activity were monitored while the phone was taking a call but was muted.为了排除人们正常接听电话时带来的脑活动力的变化,手机通话时消除了声音,同时监测脑活动力的变化。
Next, there is variation in what to call things.其次是在叫什么东西的变化。