it is an old backpack的复数形式

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itisanoldbackpack的复数形式itisanoldbackpack的复数形式itisanoldbackpack的复数形式theseareoldbackpackstheyareoldback

it is an old backpack的复数形式
it is an old backpack的复数形式

it is an old backpack的复数形式
these are old backpacks

they are old backpacks

They are old backpacks.

These are old backpacks.

应该是:They are old backpacks。