The plural form is often used for zero persons or things,


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送交者: chouqilozi 于 2008-11-18, 13:31:58:

回答: half an hour is different from half hour 由 HunHunSheng 于 2008-11-18, 13:26:40:

fractional things in a quantity greater than one, and for people or things when the quantity is unknown.



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