Moving rapidly through school, he graduated Phi Beta Kappa from the University of Kentucky at age 18.
在学校进步迅速，他十八岁时以优等生身份从肯塔基大学毕业。
《柯林斯英汉双解大词典》
2
The easy ones are on the diagonal: we both get B- if we both choose Alpha; we both get B+ if we both choose Beta.
在对角线上就更直观了：如果我们都选 α 的话得 B- ，如果我们都选 β 的话得 B+ 。
3
The plan has good chances of success, since sweet potato is a staple of the region's diet and agriculture, and the varieties currently grown contain little beta-carotene.