本文非原創，部分內容引自教子磚家夢裏江河的新浪博客。
Imagine a circle that contains all of human knowledge:
這個圈代表着人類所有的知識。
By the time you finish elementary school, you know a little:
當完成小學時，你只知道一點點：
By the time you finish high school, you know a bit more:
高中畢業時，你知道的多一點點。
With a bachelor's degree, you gain a specialty:
本科階段你有了專業所長。
A master's degree deepens that specialty:
研究生強化了專業所長。
Reading research papers takes you to the edge of human knowledge:
而後，閱讀文獻帶你到學術前沿。
Once you're at the boundary, you focus:
然後你有了具體研究方向。
You push at the boundary for a few years:
你在上面鑽研數年。
Until one day, the boundary gives way:
直到有一天，有了突破。
And, that dent you've made is called a Ph.D.:
而那個突破被稱爲PhD。
Of course, the world looks different to you now:
當然，在你看來，這個世界變得不同了。
So, don't forget the bigger picture:
但別忘了有個東西叫big picture。
總結：知道博士是幹什麼的後，你還讀phd嗎？
答：猶豫中且即將畢業的碩士研究生，如果不是爲了科學的初衷，趁早找個好工作吧！