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I need some paper to write a letter.
(我需要⼀些纸来写信。)(不可数)
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I have to write a term paper tomorrow.
(明天我得写我⼀篇学期论⽂。)(可数)
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There’s no room for another person.
(这⾥没有空间再装下⼀个⼈了。)(不可数)
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There are four rooms in my house.
(我家有四间屋⼦。)(可数)
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a sheet of glass
(⼀⽚玻璃)(不可数)
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three glasses
(三只玻璃杯)(可数)