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philanthropy的复数形式为：philanthropies...
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gymkhana的复数形式为：gymkhanas...
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silicate的复数形式为：silicates...
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cascade的复数形式为：cascades...
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distillery的复数形式为：distilleries...
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painkiller的复数形式为：painkillers...
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jacksnipe的复数形式为：jacksnipes...
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bicentennial的复数形式为：bicentennials...
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enterostomy的复数形式为：enterostomies...
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geophysicist的复数形式为：geophysicists...
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gonococcus的复数形式为：gonococci...
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dogmatist的复数形式为：dogmatists...
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walking stick的复数形式为：walking sticks...