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花心的英语是 "fickle hearted" 或者 "unfaithful". 这个词来源于拉丁语，fickle 意为不定的、无常的，heart 意为心脏。例句：
He had a fickle heart and couldn't remain faithful to any one person for long.
She was known for her unfaithful ways and fickle heart.
I thought he loved me, but his fickle heart led him astray.
来源：作文地带整理
