The tiny, yellow birch leaves are rustling.

小小的黄桦树叶沙沙作响。

Then we have the hard wood called oak, and the pretty dark-red mahogany, and the yellow birch.

还有比较硬的木材。硬木里有橡木, 英语叫oak；还有漂亮的暗红色的红木, 英语叫mahogany；还有黄色的桦木, 英语叫birch。