心脏病发前并未出现呼吸困难或胸痛的病征。

There had been no sign of either breathlessness or chest pain before the heart attack.

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也可能会出现胸痛或心悸。

They also might have chest pain or palpitations.

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也可能会出现胸痛或心悸。

They also might have chest pain or palpitations.

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