elective
adj
1 [usu attrib 通常作定语]
having the power to elect 有选举权的
an elective assembly 有选举权的大会.
2 chosen or filled by election 选任的; 由选举产生的
an elective office 选任的职位.
3 (esp of an American university course, etc) not compulsory; optional (尤指美国大学课程等)非强迫的, 任选的, 选修的
elective subjects 选修科目.
4 not urgently necessary 非急需的
elective surgery 非急需施行的手术. elective, n (esp US) optional course or subject studied at school or college 学校的选修课或选修科目
She is taking French as an elective next year. 她明年选修法语.
Libraries made education possible, and education in its turn added to libraries: the growth of knowledge followed a kind of compound interest law, which was greatly enhanced by the invention of printing.