柯林斯詞典silver birch (silver birch) 1. N-COUNT A silver birch is a tree with a greyish-white trunk and branches. 銀皮樺樹 返回 silver birch劍橋詞典a common type of birch tree that has a silver-coloured trunk and branches 白樺樹,銀皮樺 返回 silver birch