They never startled one robin by being sudden enough to seem dangerous or threatening.

它们从不会很突然吓到一只知更鸟，让它们好像觉得危险或受到威胁。

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The stress alone may be enough to lead to sudden cardiac arrest.

孤独的压力可能已足够到导致忽然的离去。

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The stress alone may be enough to lead to sudden cardiac arrest.

孤独的压力可能已足够到导致忽然的离去。

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