New words：

serpent [ˈsɜrpənt] n. 蛇；（尤指）大蛇
cast [kɑ:st] v. 蜕(皮)；脱(壳)；脱落

Sample Sentences：

Serpents cast their skin once a year.
I killed a serpent but my fear's always there.
The peach trees cast all their blossoms after the heavy rain.

blossom ['blɔsəm] n.花朵

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