lead in:

导入；引入线；开场白

She took the lead in the second lap.

她在第二圈时领先。

lead into:

导致；引起

Countless Numbers of people have tried to change lead intogold.

无数的人尝试过要把铅变成金子。

Active fiscal policy will soon take the lead in stimulating the economy .

积极财政政策很快将在***经济方面发挥带头作用。