形容词
中文翻译：预兆的
同义词：
['prodromal', 'premonitory']
例句：
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1. The patient's symptoms were presymptomatic of a serious illness.
患者的先兆症状预示着一场严重的疾病。
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2. The researcher found that the virus had a prodromal phase before it caused symptoms.
研究者发现，该病毒在导致症状之前有一个前驱期。
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3. The doctor advised the patient to monitor their symptoms closely during this period.
医生建议患者在此期间密切监测症状。