to build up to sth
1.+ action为…作准备
Other actions we need to take may be more difficult, and we may have to build up to them gradually.我们需要采取的其他行动可能会更加困难, 所以我们可能得一步步地为之作准备。
2.+ announcement, revelation, climax准备;逐渐推向
Carl was building up to something.卡尔酝酿着要说些什么。