求翻译：此外，非洲留学人员的培训层次和学科领域也在提高和优化，2007年获奖学金的留学生中，攻读硕士和博士学位的学生已占57.3%。是什么意思？

In addition, the training of African students studying levels and disciplines are optimized. Students studying for master's and doctoral degrees accounted for 57.3 percent of students awarded a scholarship in 2007.

In addition, the Study Abroad staff training levels and areas to improve and optimize, and in 2007 received a scholarship for students studying in the master's degree and doctorate students have accounted for 57.3 % .

In addition, the Africa person who study abroad's training level and the discipline domain also in the enhancement and the optimization, in the foreign student who in 2007 attains the scholarship, studies for master and the doctorate student has accounted for 57.3%.

In addition, the personnel training of level and field of study abroad in Africa also improve and optimize 2007 scholarship student, studying for master's and doctoral degree students have accounted for 57.3%.

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