jellyfish [ˈdʒelifɪʃ]

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n.水母，海蜇，意志薄弱的人

a sea animal with a soft oval almost transparent body

You can get a nasty sting from a jellyfish.你可能会被水母狠狠地蜇一下。
Her husband is a perfect jellyfish.她丈夫是个典型的优柔寡断的人。