As a result, only a small fraction of your mental capacity remains engaged in what is before it, and mind-wandering and ruminations become a tax on the quality of your life.

结果，只有一小部分心智仍然在参与眼前的事物，走神和沉思变成提高生活质量的负担。

youdao

It must become the only thing on your mind.

CNN: Zuckerberg's hoodie is savvy, not snotty