1. （火箭、导弹或卫星的）发射坪，发射台
A launch pad or launching pad is a platform from which rockets, missiles, or satellites are launched.

2. 跳板；踏脚石
A launch pad or launching pad is a situation, for example a job, which you can use in order to go forward to something better or more important.

1. a platform from which rockets or space craft are launched

Synonym: launching padlaunchpadlaunch areapad