bark [bɑ:k]

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n.（狗）等吠声，狗叫声，树皮；vt.狗叫

the hard outer covering of a tree

The old bark dropped away. 老树皮剥落下来。
Dogs always know who's bad and will naturally bark at them. 狗永远知道谁是坏人，而且一定会对他们吠叫。