headfirst

頭朝下地、頭先著地地

He slipped on the ice and fell headfirst into the snow.

他在冰上滑倒，頭朝下摔進雪堆裡。

貿然地、魯莽地、一頭栽入地

She jumped headfirst into the new job without asking questions.

她什麼都沒問就一頭栽進這份新工作。

頭朝下的、頭先入水的

His headfirst dive into the shallow pool looked dangerous.

他頭朝下跳進淺水池的動作看起來很危險。