verb · To put resources, time, or capital into a project or business

公司决定向这个研发项目投入更多资金。

verb · to throw oneself into a task or activity; to get involved

全校师生都积极投入到校运会的准备中。

verb · to put something into use or operation (typically referring to technology, funds, or personnel being assigned to a field or project)

这项技术已投入商用。

verb · to throw or put something physically into a container or place

他把硬币投入了自动售货机。

adjective · to be deeply engrossed, focused, or emotionally involved in something

他听音乐听得很投入，完全没注意到我进来。