名词
中文翻译：未定之物
同义词：
['uncertainty', 'pending matter', 'unresolved issue']
例句：
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1. The antecedent of the sentence is not clear.
这句话的先行词不清楚。
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2. The government has yet to provide a final decision on the antecedent issue.
政府尚未对悬而未决的问题给出最终决定。
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3. The antecedent of the investigation was the missing person's DNA sample.
调查的先决条件是失踪人员的DNA样本。