if and when
连词 conj.
英文释义
连词 conj.
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At the time of an event, contingent on that event happening at all.
— [T]o his son Thomas Battersbee, if and when he should attain the age of 21; but if he should die under that age then to his daughter Sophia, if and when she should attain that age...
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数据来源: Wiktionary