动词投入

1. 投入：fling off 发出 | fling oneself into 投入 | fling 投

2. 毅然投身于; 奋力从事：fling oneself out 手舞足蹈; 发怒而暴跳 | fling oneself into 毅然投身于; 奋力从事 | fling oneself upon 毅然投身于; 奋力从事

3. 奋力从事：have one's fling 放荡 | fling oneself into 奋力从事 | flutuate between hopes and fears 喜忧参半