投身于的英文：
fling oneself into
pitch into
throw oneself into the lap of

参考例句：

He devoted himself into the construction of a legal framework.
他投身于创建司法系统的事业中。

He threw himself into work once he got back from his holidays.
他度假一回来就投身于工作。

Snow was the rare journalist who consciously and generously placed himself in his work
像斯诺这样自觉自愿、落落大方地投身于本职工作的新闻记者是不多的。

He took to the religious life and at first set no limit to his austerities.
他投身于宗教生活，一开始就竭力刻苦修行。

After retiring,she became involved in voluntary service in the local community.
她在退休后投身于当地社区的志愿服务工作。

He was the son of a well-to-do tradesman, had been to college in London, and was to devote himself to business
他是个富商的儿子，在伦敦上过大学，即将投身于商界。

devote oneself entirely to something; indulge in to an immoderate degree, usually with pleasure.
将自己完全投身于某事；无节制地沉湎于其中通常为乐事。

Only when one plunges into the powerful current of the times will one’s life shine brilliantly. —— Abraham Lincoln
一个人只有投身于伟大的时代洪流中，他的生命才会闪耀出光彩。——林肯

One of the most unusual characters is this ex-ballet dancer who has devoted himself to the goldsmith art.
这个城市特色之一是这个前芭蕾舞演员，现在他已投身于黄金艺术的创作。

Although a classically trained painter, he embraced vanguard ideas and made radical art.
尽管接受的是经典教育，这位画家却信奉前卫理念，并投身于激进艺术的创作。

fling是什么意思：
n. 投，掷，抛；一时的放纵
v. 扔，掷，抛；猛扑，猛冲；投身于

To cast,fling,or hurl something.
投、扔或掷某物

The iron flings align themselves in the direction of the magnetic field.
铁屑按磁场的方向排列。

At least I can say that it wasn't fling.
至少我可以说那不是一时的放纵。

oneself是什么意思：
pron. 自己；亲自，自行

apologize for oneself
为自已解辩或辩护

pride oneself on
使得意

embroil oneself in
使某人卷入纠纷

into是什么意思：
prep. 进入…中；进入…状态；持续到；输入