名词
中文翻译：Unknown
同义词：
['cause', 'reason', 'prerequisite例句：1. The decision was based on the antecedent conditions.（这个决定是基于先决条件做出的。）']
例句：
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1. The decision was based on the antecedent conditions.
这个决定是基于先决条件做出的。
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2. The antecedent of this event is still unknown.
这个事件的先兆仍然未知。
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3.The antecedent of the disease is often found in poor sanitation.
这种疾病的先兆通常出现在卫生条件差的地方。