this pair of trousers----------twenty dollars.1are 2is 3/ 4am

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this pair of trousers----------twenty dollars.1are 2is 3/ 4am

this pair of trousers----------twenty dollars.1are 2is 3/ 4am
this pair of trousers----------twenty dollars.1are 2is 3/ 4am

this pair of trousers----------twenty dollars.1are 2is 3/ 4am
is 有pair 是单数