several pieces of wood/a piece of wood为什么只能用several pieces of wood,而不用a piece of wood呢?

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severalpiecesofwood/apieceofwood为什么只能用severalpiecesofwood,而不用apieceofwood呢?severalpiecesofwood/apiec

several pieces of wood/a piece of wood为什么只能用several pieces of wood,而不用a piece of wood呢?
several pieces of wood/a piece of wood
为什么只能用several pieces of wood,而不用a piece of wood呢?

several pieces of wood/a piece of wood为什么只能用several pieces of wood,而不用a piece of wood呢?
可以用a piece of wood 一块木头,对的.
wood作木头解释是不可数名词,所以用 a piece of修饰.

several 意思是几个
所以不能加 一个