C2If aperiodoftimeorseriesofeventsleadsup to aneventoractivity, ithappensuntil thateventoractivitybegins.为…作铺垫；是…的先导Thepilothad norecollectionof theeventsleadingup to thecrash.飞行员想不起飞机坠毁前发生了什么。More examples
I was veryanxiousin thetimeleadingup to theevent.
Themomentsleadingup to theaccidentare veryconfusedin mymind.
Whatexactlyledup to hisresignation?
Theydocumentedall theeventsleadingup to themassacre.
I wasillin theperiodleadingup to theelection.
(TALK)
topreparetotalkabout something bygraduallymentioningthesubjectyouwanttotalkabout缓慢过渡，慢慢引导Hestartedtellingme about awonderfulnewrestauranthe'd been to and Iwonderedwhat he wasleadingup to.他开始跟我讲他去过的一家很棒的新餐馆，而我则在想他到底想要说什么。#https://dictionary.cambridge.org//dictionary/english-chinese-simplified/lead-up-to-sth##
