headfirst ['hedf'ɜ:st]

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附加级

adv. 头向前地, 不顾前后地

He lost his balance, and pitched out of the window headfirst. 他失去平衡，头朝下从窗子上跌了下去。
Dive: To plunge, especially headfirst into water. 跳水：潜入水中，尤指头先下水的跳水。