首先试着从历时角度解释一下study和student元音音值不同的原因:
查阅英语词源字典得知,这两个词都是来自古法语(Old French)。
student (n.)
late 14c., from Old Frenchestudiant"student, scholar, one who is studying" (Modern Frenchétudiant), noun use of past participle ofestudiier, from Medieval Latinstudiare"to study," from Latinstudium(seestudy(v.)). An Old English word for it wasleorningcild"student, disciple."Student-teacherof a teacher in training working in a classroom is from 1851, American English.
study (n.)
c. 1300, "application of the mind to the acquisition of knowledge, intensive reading and contemplation of a book, writings, etc.," from Old Frenchestudie"care, attention, skill, thought; study, school" (Modern Frenchétude), from Latinstudium"study, application" (seestudy(v.)). Also from c. 1300 as "a state of deep thought or contemplation; a state of mental perplexity, doubt, anxiety; state of amazement or wonder." From mid-14c. as "careful examination, scrutiny." Sense of "room furnished with books" is from late