run-up
noun
uk/ˈrʌn.ʌp/us/ˈrʌn.ʌp/[C]
In somesports, a run-up is aperiodordistanceofrunningthat you do inorderto be goingfastenough toperformaparticularaction
助跑；助跑距离
Thelongerandfasteryourrun-up is, thehigheryou canjump.你助跑的距离越长、速度越快，跳得就越高。
[S]mainlyUK
thefinalperiodoftimebefore animportantevent
（重大事情的）前奏，前期，准备阶段
Everyone is verybusyduring the run-uptopublication.书出版前的最后准备阶段，每个人都在紧张地忙碌着。