New Words：

den [den] 兽穴；书房；兽窝；窝点
branch [brɑːntʃ] 树的分枝（区别于“主干”）
branches [ˈbrɑːntʃɪz] branch的复数
log [lɒɡ] 采伐后未经加工的木料

Sample Sentence:

The tiger went back to its den.
I can see the branches of the trees.
I saw a man saw a log with a saw.
She went to warm her hands by the log fire.

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