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insidious

/ɪnˈsɪdiəs/

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1 · adjective

gradually causing harm without being noticed

潜伏危害的；隐匿的

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The disease had an insidious onset and was hard to detect.
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这种疾病起病隐匿，因此很难察觉。
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Pronunciation: /ɪnˈsɪdiəs/

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