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KK:
[`ɑpʃәnḷ]
DJ:
[`ɔpʃәnәl]
adj.
1.
随意的; 非必须的
n.
1.
选修科目
同义:
adj.
自愿的, 志愿的
voluntary
elective
反义:
adj.
随意的; 选修的
compulsory
反义参见:
required
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housebroken
house cable
house call
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house check
houseclean
housecleaner
housecleaning
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housecraft
house credit
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houseful
house guest
houseguest
household
householder
household name
household word
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housekeep
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