He had apparently fallen headfirst down the stairwell.
他看上去是从楼梯井口头朝下摔下来的。
It is best to check the temperature of the water before diving in headfirst.
潜水前最好先检查水温。
Dad: Stop arguing. He went in headfirst.
爸爸：别吵了。他是头先进去的。
Landing headfirst in the water, he felt his pulse quicken.
一头栽倒在水中后，他感觉到脉搏加快。
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。
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。
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