Phds are the key to innovation in scientific research .
博士是科研领域创新的关键。
In the humanities , where most students pay for their own phds , the figure is 49 % .
在人文学科，许多学生要自己掏钱读学位，退出率达到49%。
Raising federal r & d spending and easing immigration for foreign-born phds would boost innovation and company successes , but would not produce many jobs .
提高联邦研发支出和放松外籍高学历人才移民将推动创新和企业成功，但是不会创造多少就业岗位。
Some 40 % of american phds in science and engineering go to immigrants .
全美百分之四十的科学和工程类的博士学位授予了移民。
About 40 % of people earning phds in computer science and engineering are foreign-born .
