wood可數(shù)嗎

　　He looped the rope over the wood.

　　他把繩子打了環(huán)系在木頭上。

　　She carves in both stone and wood.

　　她既做石雕也做木雕。

　　If it's made of wood it will float.

　　這要是木材做的就能浮在水面上。