optional

英['ɔpʃənl]美['ɑpʃən！]

a.
1.随意的；非必须的
n.
1.选修科目

副　词：op'tionally

反：	[a.] obligatory

Universities have responded to demands for students to have a better knowledge of industry by offering optional business courses in arts degree.
学生必须更好地熟悉工业，针对这一要求，大学已作出反应。在文科学位里，开设商业选修课。收藏
23 courses in elective and optional subjects to provide breadth and depth to your program is accordance with your personal objectives.
选修课有23门，使你扩展专业知识，以便更符合你的个人目标。收藏
Is French compulsory or optional || Is French required or selective？
法语是必修课还是选修课？收藏
Added optional extra argument to gmp_init(). The extra argument indicates which number base gmp should use when converting a string to the gmpnumber.
增加了gmp_init()可选的额外参数。参数指出在gmp把字符串转化为gmpnumber时的数字基数收藏
The cassette player is an optional extra in this make of car,ie It will cost extra if one chooses to have it
这种型号汽车如需盒式磁带唱机费用另计收藏

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