lead from up to down由上引来再引下
lead up to convention导致开会
lead up to sth作为……准备;翻译
lead up to weakness攻向弱牌
lead up to a conclusion引出结论
lead from down to up由下引来再引上
PHRASAL VERB（动词词组） The events that led up to a particular event happened one after the other until that event occurred. 导致
Alan Tomlinson has reconstructed the events that led up to the deaths.
阿伦·汤姆林森再现了导致死亡的事件。
PHRASAL VERB（动词词组） If someone leads up to a particular subject, they gradually guide a conversation to a point where they can introduce it. 逐渐引到 (某一个话题)
I'm leading up to something quite important.
我正要说到很重要的事情上。