launch on/upon
make a start on； commence开始
The opposition speaker launched a bitter attack on the government's mishandling of the taxpayers'money．反对党演讲者猛烈抨击政府使用纳税款不当。
The factory launched on the production of walkingtractors on a large scale．这家工厂开始大规模地生产手扶拖拉机。