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challenge

/ˈt͡ʃæl.ɪnd͡ʒ/

含义 1

A difficult task or problem to overcome.

“He faced a challenge while climbing the steep mountain.”
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challenge 的插图：A difficult task or problem to overcome.

含义 2

a call to engage in a contest

“She issued a challenge to her friend to race.”
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challenge 的插图：a call to engage in a contest