antecedent
n. 先例，前身；祖先，社会与家庭背景（antecedents）；先行词，前述词；（逻辑）前件
adj. 先时的，先前的；（语法）先行的
复数 antecedents
例句
In 'He grabbed the ball and threw it in the air', 'ball' is the antecedent of 'it'.
在He grabbed the ball and threw it in the air一句中，ball是it的先行词。
《牛津词典》
You have sufficient reason for affirming the antecedent.
你有充分的理由肯定先例。
Upon contracting government projects, the antecedent money for bidding may be reduced by up to 50%.
承揽政府工程时，押标金、得降低百分之五十以下。
